I thought the movie was good, not quite as good as the first one, but still entertaining. I did think that Kenneth Branagh had a better feel for the material, but this sequel still felt similar. The first movie also had a sharper sense of humor compared to The Dark World.
I may be in the minority here, but I'm tiring of Loki. He was a great character for the first movie, OK in The Avengers, but he's really becoming too prominent in the Marvel movies.