I have seen it twice (3D on opening night and 2D) and have 2 more invites to go see it (which I will)
In my opinion this is the best CBM. There was a massive risk this could be a disaster and people were concerned Joss Wheldon was directing it. But from a fan of his (comics, not tv shows), I knew he could write a great script.

He has now wrote his own ticket with a $1b movie by end of next week. He almost guarantees to do Avengers 2, but i feel for him. The pressure to make it better is huge... lucky he has a stake of great stories to work with (Civil War, Infinity Gauntlet).

Personally one of the best popcorn flicks I have watched in the last decade.

Now the pressure is on Iron Man 3 to be huge again.