Harry - Ginny- No in the films, they are so awkward..
Ron - Hermione- My favourite couple. They are perfect for each other. Rupert and Emma play their parts perfectly in DH. They're just awww Can't wait for the kiss
Lupin - Tonks- They would be good if they had more screen time. I they didn't have a baby, many people wouldn't know that they were a couple
Bill - Fleur- Again, not enough screen time. Maybe there will be more in DH 2
James - Lily- I like this couple. They're so adorable
Arthur - Molly- They are a good couple
Lucius - Narcissa- I don't really see the chemistry for these two :|
other pairings:

Harry - Cho- Not really no...
Hermione - They were cute but Hermione is meant to be with Ron
Ginny - Dean- Meh...
Cedric - Cho- I like this couple
Bill - Tonks as Mrs. Weasley wanted it- This would be a good ship because they are both laid back and cool
George - Angelina- I like Fred with Angelina and George with Katie better...
Snape - Lily- I like this ship.. They're cute. It's sad for Snape. :'(

Ron and Hermione have the best chemistry in the books and films. They were amazing in Deathly Hallows! How beautiful was it when Rupert brushed Emma's face when she was about to perform the memory charm and when she called out after him when he left them.

Molly and Arthur interact so adorably and you really get a sense of partnership between them.

I don't like Harry and Ginny together much, mainly because I see Harry as pretty much part of the Weasleys.

Snape and Lily's story is the most beautiful out of all the couples and its a shame they never got together. I always wonder what Lily saw in James.

Ginny should be with dobby or someone other than harry I would say Ron but that's awful

Ron/Hermione - I've nothing special for nor against this couple. In my opinion, it's too... Predictable?

Lupin/Tonks - Great couple. It's a shame they cut the part where Tonks publicly confessed her love for Lupin in the Half-Blood Prince. I hope there's more of them in Part 2. Based on the trailer, it seems like we will see more of them.

Bill/Fleur - Too little screentime. They even cut their parts in the Half-Blood Prince (after Bill was brutally savaged by Fenrir Greyback). Not much in the Deathly Hallows Part 1 too. Hope to see more of them in Part 2.

Snape/Lily - My OTP. Even though HP is not a romance themed/genred series, Snape's devotion for Lily is probably the strongest I've ever known. Alan Rickman's portrayal of Snape is undeniably outstanding as he already knew that Snape is still in love with Lily. As in The Prince's Tale, I hope Benedict Clarke & Ellie Darcey-Alden (younger versions of Snape & Lily) will do the justice.

I think Ron & Hermione have the best chemistry. I just think that the way they sort of hate each other at the beginning but it turns into something else is just amazing.

I think Harry and Ginny are great, too. Especially how Ginny had a crush on Harry since the start.

I think the chemistry between ron and hermione is great in the books and films they are the best couple in the series in my opinion

Ron and Hermione are the best of the lot. Harry and Ginny needed to be more lovey to each other I think. They still seemed a bit cold. I understand he has alot on his mind and all but jeepers. From what I see they do show more emotion to each other in the last film so lets hope.
They should have explained more about Tonks and Remus. People who read the books know what is going on but they don't fully explain that they were married and are expecting a child!
Snape and Lily: That will show the softer side of Snape. Who would have thought.
They are all great though. Can't wait for the R/HR kiss!!!

Harry - Ginny: Absolutely no. Their relationship in the movie just didn't work. Their scenes were awkward, and not well done, so the actors couldn't really be any good and have any chemistry. Besides, DanRad considers Bonnie like a sister, and that has to make it hard to act, so really it cannot work.

Ron - Hermione: They were so beautiful together. The acting, tension, sparks, it just worked. It may have been predictable, but it worked.

Bill - Fleur: They had a lot of potential, and from what we saw they seemed pretty good together, but at the same time with the lack of screen time, you can't really tell.

Lucius - Narcissa: If there were more screentime, this would be a really interesting couple. Just how they act seems like it would be interesting, but you can't really tell.

I would comment more, but there isn't really a lot to say. Most you can't tell by lack of interaction between the characters, and screen time. RonHermione though has a lot of chemistry.

of course Ron and Hermione. they were the perfect couple, I hope they will become a real lover

Harry - Ginny: in the book-100% YES. they cut some good scenes of them out- like when they first kissed. In the movie- they might be the most awkward pairing ever. especially during kissing scenes. just no.

Ron - Hermione: These two are alright together but i definitely would have liked to see them "together" more in the movies. you know, acting as a couple.

Lupin - Tonks: love love love love love. in the movies and the books. natalia tena is freaking gorgeous.

Lucius - Narcissa: helen mccrory is beautiful. they play a great couple.

Hermione - Viktor: i love them together in the books. and in the movies they are really cute when it comes to "flirting" It would have been a good twist if they ended up together. but she belongs to won won.

Snape - Lily: this actually makes me extremely sad to think about. obviously we wouldnt have harry potter if they ended up together. But it is heart breaking to know that snape was so in love with her and never had her. i think they would have been an interesting couple, and lily would have brought out the good in him.

I thought they where all perfect for each other too. Great job jk, the nation thanks you!

I do ship Ron and Hermione. But when I watch the movie I can't help but adore Harry and Hermione's chemistry as well.

I love Jason Issacs and Helen Mccrory they were awsome- i love how they make them look alike eachother even with Tom Felton who could even be a serect real life child of Jason!!!!, I didnt think the writers gave Helen enough as she has alot in the 6th book if I remeber along with the 7th as well but I really think Helen & Jason were perfect for the role along with tom, has anyone notice that Draco and Narissica Malfoy have the same eyes???

I loved everybodies relationship

EXCEPT

Harry & Cho= NOTHING

George & Angelina= 

I love all the pairings you named EXCEPT for Harry and Ginny. One word for their relationship? AWKWARD!

I love all the pairings in the books but not in the movies.

Harry/Ginny--I really hate their relationship in the movies because 1. NO Chemistry at all between the actors which equal AWKWARDNESS on screen
2. Ginny, in my eyes, was badly written in the movies. She was center in COS but then nothing at all just cameos until OOTP and what idiotic lines Bonnie was given...just ruined the character for me.

I totally ship Harry/Hermione in the movies because the chemistry between Dan and Emma was fantastic (more even than Emma and Rupert in my opinion).

Rowling wrote the relationships very subtly and in a way that you could go all the way back to Book 1 and see the hints of what was to come. In the movies, they didn't have that ability and in a way it hurt the movies. If they were to do the movies now, instead of 10 years ago, with all of the books written--I think that the chemistry/pairings would be treated much more differently than they were

Harry - Ginny (Dan Radcliffe & Bonnie Wright)
I get kind of embarrassed every time I see them on screen. I think they are too different as people to actually work together as a couple (Bon and Dan, not Harry and Ginny). Honestly, they are not believeable at all as a couple, and that's one of the reasons why I don't ship them anymore.

Ron - Hermione (Rupert Grint & Emma Watson)
I love both actors, but they work better as friends. You can see that they have chemistry, but it gets somewhat awkward at times. Thank god for Rupert's actor skills.

Lupin - Tonks (David Thewlis & Natalia Tena) MY FAVORITE SHIP EVER!
David is exactly how I pictures Lupin. Natalia is somewhat how I pictures Tonks (not really). I got very disappointed to see that they have almost no scenes together in any of the movies, so you can't really tell if they have good chemistry. I've seen interviews with David and Natalia and they are very much like their characters which makes me believe that if they had more time together on screen, it could actually work.

Bill - Fleur (Domnhall Gleeson & Clemense Poesy)
Again, not enough on screen time for me to decide if they have amazing chemistry. The little I saw was adorable (DH2 when giving each other looks).

James - Lily (Adrian Rawlins & Geraldine Somerville)
Perfect. They are the perfect James and Lily for me.

Arthur - Molly (Mark Williams & Julie Walters)
Again, perfect. Julie is the perfect Molly, and even though I pictured Arthur a bit different, he still has great chemistry with Julie. This is probably the couple with the best chemistry IMO.

Lucius - Narcissa (Jason Isaacs & Helen McCrory)
Yet again, not enough screen time together for me to decide.

I HATED Harry with Giny, but thought him and Cho were so sweet. I wish they'd stayed together, much nicer than Ginny!