Now that I've had a little time to think about it I think I know why it didn't feel as epic as it should have. Both the redemption of Thor and the romance with Jane seemed to happen literally overnight. Had they stretched these two story points out a bit longer, the whole movie would have felt more real.
Some other thoughts:
The best scene is a quiet scene when Loki visits Thor on earth. A touching scene between two brothers, even though Loki was obviously being deceitful.
Skif (is hot) and seems to have a crush on Thor
The humour works - similar to Iron Man
Nice references to Don Blake MD
Irrelevant intro to hawkeye, who wasn't mentioned by hero name, but briefly called by name.
The warriors three were fun; hope they have a bigger role in future films - I'd love an epic film to the other realms with them as sidekicks