My main problems with the movie revolve around the title character himself. The development of his characterization throughout the movie felt rushed and unnatural, and I didn't like how the Donald Blake aspect of his character was removed.
Of course, I wasn't fond of Natalie Portman's character, the whole "Asgardians as aliens from another planet" thing, or the emo characterization of Loki, either.
I admit I'm not a big fan of Thor, and I haven't read many of the comics, but I can still recognize what a Thor movie should be like, and this isn't it.