I was disappointed in this sequel. The characters that were so enjoyable in the first movie were not as interesting or heroic this time. There was no hero to root for. There were only stupid anti-heroes and weasels in this movie. The back story of the Russian scientist was unintelligible, the side story of SHIELD was not developed or explained, I don't understand how the EXPO model became a new element, and other than her 20 second kung-fu fight, Scarlett Johansson was wasted in the movie. Iron Man didn't even get in costume until the movie was half over. I saw pieces of a good story line, but the whole was much less than its parts. And that's too bad.