Saw it last night & am hugely pleased to report that all the good press the movie is getting is definitely justified.
I won't go into specifics as I know it's not out in the US for a while but if you have even a passing fondess for any of the characters, you should watch it immediately.
Not only is the action top notch, the characters, pacing & script are all incredibly tight. I'm already a huge Joss Whedon fan but this is something else... I really hope this means we'll get to see more of his brain on screen in the future.
The effects work is absolutely superb, specifically the Hulk who is simply
phenomenal - hats off to Gio/Kris & everyone who worked on him. I cannot put into words how good he looks & acts. I really hope there's some decent behind the scenes on the work everyone put into him
Anyway, as a film it still has flaws but they are miniscule compared to the sheer level of balls-out fun the other 98% of the movie is. I genuinely can't wait to see it again!