The movie was great. Characters were mostly great (with the exception of bland Hawkeye), this was my favorite Hulk yet. And it had the right amount of Whedon humor injected in.
The scene with Hulk smashing Loki had me screaming 
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I can totally see Black Widow getting her own spin off. Whedon's background of writing strong female characters payed off because even though she is in actuality the least "powerful" member of the team everything about her character >>>>>>>>