*Thor spoilers*
Thor's a pretty enjoyable movie, but it suffers from a few things IMO.
1. Too much time spent on SHIELD. For some reason they are like, the bad guys, and in the context of the movie that never really gets resolved.
2. The development of Thor. The movie starts off with him being a brute that loves war and wants to kill all the frost giants with his bare hands. So Odin takes away his hammer and makes him mortal because he's unworthy. Then later he sacrifices himself and is suddenly worthy and the hammer returns to him, and afterwards he's all wise and stuff, and he's left his genocidal behaviour behind.
The problem is..... they don't really display any growth from losing the hammer to getting it back. Just him walking around smiling all the time. The scene where he tries to pick up his hammer and he fails was admittedly a very good scene towards this characterization, but that certainly didn't carry him from genocidal brute to wise ruler, and nothing else in the movie really fills in the gaps.
3. Loki was interesting, and he certainly was a conflicted character, but it seemed awkward at times telling what the hell he even wanted.
4. The Destroyer fight scene towards the end of the movie was a little weak. The Destroyer itself was awesome, but those Asgardians fighting him were.... pathetic.
Still, I did enjoy the movie a lot . The opening fight with the frost giants was awesome, and I did enjoy Hemsworth as Thor. I'd definitely put it at the bottom of my ranking for the films though.
I would highly recommend watching The Incredible Hulk with Edward Norton. It's a very good movie and Norton is great in it. Ruffalo is great as Banner in the Avengers too, but Norton's performance is definitely worth seeing. I don't feel like seeing someone else as Banner took anything away from the Avengers either, if that's what your worried about. It doesn't really matter for backstory or anything though, so if you want you can wait till after the Avengers to see it if you really want to see the Avengers soon.
RANKINGS:
The Avengers
Iron Man
Captain America
The Incredible Hulk
Iron Man 2
Thor
BONUS RANKING: Ang Lee's 2003 Hulk
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The batman villians all seem to be one big joke that batman refuses to laugh at - SantaRPG