I am burdened with a glorious purpose
Perhaps most surprisingly, it actually made me care about the Hulk. Previously, my opinion had been that the Hulk franchise is the graveyard in which vaguely artsy Hollywood actors bury their dreams of action movie stardom. But I found Mark Ruffalo to be pitch perfect as a worldweary guy constantly battling the enormous green lesser angel of his nature. And to be truly scary in one sequence. CGI doesn't generally make me feel fear so that was exciting.
Also! ScarJo was pretty great. I've always liked her, but I thought the character was a bit of a throwaway in Iron Man II. I think that Whedon probably gets much of the credit for that, given that he has a previously demonstrated ability to write female action-hero characters, but in the hands of most actresses, she would have been a ridiculous sex bomb.
Yes, it's a bit ungainly (too many characters, too many dimensions of conflict) and some of the characters aren't drawn with a lot of depth as a result. For example, if I were an Avenger, I'm pretty sure I'd end up shoving Captain America off the helipad out of annoyance at his general moral uprightness. And the movie doesn't do much with Hawkeye - he's in a ton of scenes, but it's hard to figure out, precisely, what the point of him being in this movie is (other than to allow me to continue to indulge my attachment to JRenner). And Whedon does do a VERY WHEDONESQUE THING THAT MADE ME VERY UNHAPPY, which, if you've seen it, you know what I'm talking about.
But all that aside, I really was pretty delighted with it. And I haven't even talked about Loki and Thor's hilario-awesome dialogue! Or how weirdly attractive I find the Hiddleston to be! Or the fact that I found myself, strangely enough, wishing for MORE Gwyneth Paltrow!
In short, it was $11 well spent. Of course, I'll need to cleanse my mind of the stain of something Actually Good by watching something bad, to return me to my normal equilibrium. Perhaps I can Netflix Mongolian Death Worm?