Went to see the Avengers - non 3D. It was a full house and it was great. Lots of one liners and subdued comical remarks. Robert Downey Jr even referenced Point Break in regards to Thor. It really energized the crowd to the point of applause at some of the triumphs of the film.
The special effects were also top notch and left nothing to be desired. We were in the theater for about 2.5 hours and it was never dull. I'd recommend it for anyone from 6 to 60.