I just saw The Avengers with my son as part of his birthday present.  It was fantastic!  I’m not going to do a full review because of time and I wouldn’t know where to start.  This one pretty much got it right.  It’s clever, fun, contains no major gaping plot holes that I could see, has characters that aren’t interchangeable, and respects the source material.  That last part is key and what separates this movie from, say, last year’s fiasco named after a certain famous Cimmerian.  It’s worth going to see, even if you have to wait a few days to get tickets.