The Avengers came out this past weekend, and I talked Kristin into seeing it for our date night on Friday. We had already seen all the lead in films--Thor, Iron Man 1 and 2, The Incredible Hulk, and Captain America--so we were familiar with all the heroes. It was fun.
It was very much a comic book movie, with all the team-ups and intra-team fights you expect from a comic book movie. In fact, that was Kristin's biggest complaint: it had all the team-ups and intra-team fights you expect, which made it kind of predictable. There was Thor vs. Iron Man, Thor vs. The Hulk, Black Widow vs. Hawkeye. There were Iron Man and Captain America vs. Loki, Thor and The Hulk, Captain America and Black Widow, and Captain America and Thor vs. the aliens. And, of course, the big battle scene at the end against said aliens. There were a few other points of predictability.
All that said, it doesn't matter. It was still great fun. The action was exciting. The characters, each of whom is strong enough to carry his own film, nevertheless worked well together. They all had a chance to shine without anyone overwhelming the others. The dialogue was as funny as you'd expect from Joss Whedon, and the action was exciting. All in all, it was definitely worth watching.