Ya.....it was really quite disappointing.
At the same time, it's a hard to tell people not to watch it, because it is in many respects a very fun, entertaining movie. It's not hard to like this movie if you're just looking for some nicely directed hero fights, and a hefty helping of jokes to keep things from getting too serious.
For me though, I wouldn't watch it again, and am rather worried I may have little to look forward to from Marvel in the future.