Okayyy, I haven't seen Avatar but I've heard it's one of the most amazing things, espicially in special FX, since Lord of the Rings. I'm not denying it, but HBP definitely does have a good chance!

Did you SEE the bridge collapsing or the death eater flight through London at the start?! Even when the death eaters mess up the great hall after they kill Dumbledore and shatter the stained-glass windows is great!?