The movie is okay on its own if there was no such thing as Alien. Unfortunately though, it feels more like a video game translation than an excellent Alien prequel. Characters and designs are flat, and there isn't a whole lot to add to it that the audience didn't already see in the trailer. Looks great on the IMAX screen, but the 3d didn't add much to the experience.
Sorry folks, overrated. Main problem - longer movie, but less Iron Man than the first. Stark is really cool, but I want to see more of that awesome suit kicking butt. I think a lot of people are tricking themselves to like it more than they should.