There are going to be plenty of straight-up reviews out there of the first really big offering of the Summer Movie Season, so I'll spare you an attempt at all that.
1) Like many Marvel movies, I've only a cursory knowledge of Thor as he exists in comics. As a kid, the character just didn't work for me at all (I thought the same thing about Superman, so, natch), and never really grew interested in Thor. I'm not much of a swords'n'sorcery guy, and I just wasn't interested in the mix of faux-Shakespearean dialect and modern interpretation of myth. I would look at Thor in Avengers, and he always seemed oddly out of place, like seeing Chewbacca show up in an X-Files episode because it's all sci-fi.
2) I think my Kirby-adoration has given me a better understanding of Thor these days, and I've spoken some with CanadianSimon about Thor, and, frankly, I am trying to free up my budget to get my hands on some of the Walt Simonson Thor. It just sounds too good.