Just got back from it. It wasn't too bad. Mind you, I was never an Avengers fan growing up and I'm still not an Avengers fan after this movie, but I can appreciate the effort it took to coordinate such a film by using all the other comic book movies as lead ins.
I also like how nobody was overshadowed by another character and everyone got about the same amount of screen time and attention.
I've never really considered Scarlet Johansen that good looking (something about her goofy mouth puts me off), BUT she definitely has a smokin' body and this movie doesn't disappoint there. DAT ASS!