Just got back from watching this, and boy, did I enjoy it. Then again, I used to be a comics fan boy, so I'm pretty much there for all the marvel comics movies.
This is not the kind of film you'd think Kenneth Brannagh would do, but he did a wonderful job on it. Sometimes the costumes felt corny and out of place and maybe too flashy and comic booky (I can't help shake the feeling it's all plastic) but since Asgard is supposed to be this otherwordly place, hey, who are we to judge their fashion sense?
I actually liked the movie had a bit of everything, with superheroe-y action, humor (I laughed more than I expected), bit of romance, self discovery, more action... in fact, the usual superhero blockbustery material. So many things were so spot on with the comic book material and it was just at the end that I read J. Michael Strazinski wrote the script and he happens to have written the comic book as well, so it was in good hands.