Saw the Avengers yesterday night. First half of the movie was pretty boring, but second half was really good.
Captain America was even more of a lame douchebag than he was in his own movie, Thor was lame as well (at one point getting kicked around by Iron Man, while in the comics it took the entire Dark Avengers team to -temporarily- subdue him), but the Hulk made up for it all. Black Widow had a couple of good scenes as well.
Overall, it is the superhero movie of the decade.