I heard this number 2 movie was an introduction to a new (series? here we go again!) based on the Avengers. The lack of imagination (story-wise) was (supposedly) for introducing all the elements that would make the next movie... The Captain America shield, the end credits for Thor, etc...
There were some ok and funny parts, but overall, it will not be a cult classic!
Actually, I have yet to be amazed be a clever and original movie... been waiting for a few years now...