So The Avengers is pretty good. No Emma Peel, but Scarlet Johansson wears black leather so it evens out.
Actually, Johansson's Black Widow kind of steals the show in some ways. Though since it's Whedon, nobody should really be surprised. She's great. And there's a scene between she and Tom Hiddleston's Loki halfway through the movie that will blow your socks off it's so good. He's great too, by the way. In fact I'd go as far to say that without him as the unifying element the movie would probably be pretty uneven. It teeters dangerously close to being uneven anyway, but that's just fallout from having to stick all the established tones of four different film franchises together into one two-and-a-half hour movie. Whedon does as good a job as anybody could have putting it all together, and the actors are so good that it's hard to nitpick.
The way Bruce Banner/the Hulk is handled is the best part of the movie. They got it perfect in a way the other two movie's didn't. Mark Ruffalo is pretty engaging as Banner and brings a certain sadness to the character that makes you really love him. I won't give it away, but the Hulk's first appearance (and the scenes with Johansson that follow) is probably the best sequence in the movie.
We did 2D by the way, and I don't feel like I missed out on a thing by not wearing those stupid glasses. Fuck 3D. Fuck it in the ass.
If you liked Iron Man (the first one), Thor, and Captain America, then there's no reason you won't like this.