I went to see it this evening.
It was pretty good. I give it a 7 out of 10.
The story was a little stock. Just a alien invasion.
Sometimes the derpy humor was annoying.
Loki's army was WEAK, man! The only thing they had going for them was sheer numbers.
Other than that, it was good. The characters working off one another was a lot of fun to watch. I loved how they made Hulk the most interesting and badass of them all, since I didn't like the other two Hulk movies very much. THIS was a Hulk I can get behind!
The action scenes were great. I thought the fight on S.H.I.E.L.D's flying ship thingy went on a little too long. That was the only time I got kinda bored.
Bottom line, It's an exceptional summer popcorn flick.