I really enjoyed the movie
I found the movie to be a lot of fun, and that is all I expect from a Marvel movie. The CGI was awesome, the worlds created were beautiful, the villians were badass, Thor hit things with his Hammer, Loki was amazing, and there was a lot of silliness. I was well entertained for the cost of admission.
If I had to rank the Marvel movies this would be in my top 4.
I don't quite understand the naysayers to this movie. It's a Marvel movie... They all follow the same dynamic; big explosions, short on story, cool CGI, too cool for school heroes, lots of silly jokes, no real threat, and are rather predictable. Unless they make major screw ups (IM3 for example) these movies are all the same, just insert a different hero. If you haven't figured this out yet, set more realistic expectations. I go into these movies expecting exactly what is coming, and I enjoy them greatly.