I saw this in IMAX 3D, and my first advice would be to consider watching it in 2D. I don't know if it will help, but the version I saw was almost unbearable half of the movie due to lagging, choppy fight scenes. There is actually only one truly good fight scene in the whole movie, but it is sadly dragged out past its expiration date as well.

The plot is a run of the mill thing that could be fully explained in about 1 minute, yet they drag it out for hours without adding new layers to it.

The camera work ranges from terrible like in most close combat scenes to average for a high budget movie.

The sound track is completely forgettable to the point that I can't remember if there was one.

Acting however is good throughout the whole movie and you get what you expect from the characters.

Where the movie really shines is in the comedy. Most of the characters aren't funny, but the ones who are (Tony Stark and a few surprises) give this movie a well needed injection boost in the middle of the movie that keeps me from dozing off after a really weak start.

Should you see this movie? Yes if you are a real comic movie junkie, otherwise there is pretty much one thing you need to know to be able jump right to the next one, and it is easier to get that tidbit by googling than watching through the whole movie.