In a world oversaturated by tons of hero films, this is another job well done by Marvel. As far as how the story flows, and how well it was done, it is the type of film one has come to expect from a Marvel film.
I do not recommend watching it in 3-D. The coolest thing about watching this in such format was the 3-D Star Wars trailer!
The movie was totally entertaining, Paul Rudd does a fantastic job, with comedy back up from Michael Peña and rapper T.I. Kids will love, action is cool, and its just good clean fun.