I think they were both pretty decent at school, Molly strikes me as the type to be a top student in Charms, considering everything we've seen. And, something tells me Arthur excelled in Muggle studies. Truth be told, I don't see either having had tried out or were on their house quidditch team. Arthur, is a possiblity, since he has shown an interest, but Molly is doubtful in my mind.
As for popularity, I'd say Molly comes to mind, of being with the girly-gryffindor-girl's but I can't say I see Arthur being so into being with the 'in crowd'. I don't think he was a longer, or lame, in the least! But..I wouldn't say I picture him as someone like..James, or Sirius. Probably more quiet like Remus.
And Molly, probably reminds me somewhat of what I'd picture Alice Longbottom as. Tough, but another girly-gryffindor. | 
Have a very Harry day!!
Discussion# 3- Arthur & Molly at Hogwarts 
