I haven't read the other impressions/spoilers yet
but thank you for making this thread and convincing me to go see this movie...
I went to a 4:10pm showing, the theatre wasn't even a quarter packed, but I got the feeling most people there enjoyed it as well as myself. It was full of humor, action, violence, nerdy references, foul-language, and some tense moments.
I loved everybody in this movie, short of Kick-ass' love interest, while pretty, her role didn't seem convincing to me to why she started to fall for him, it was rushed and sloppy. I wasn't entirely convinced about Hit-girl during her first sequence with her blade staff but everything else afterwards was awesome, particularly her scene where she went into save Kick-ass and Big Daddy, that was so fricking spectactular! I had already seen her moment with the guns shooting up and jumping/flying off walls in trailers, but it was still pretty awesome at this point I was rooting for her full force. Nicholas Cage was surprisingly good in this movie, and was sorry to see his character killed off.
The nerd friends were a little annoying. The movie's message to blend realism superheroism with some of the more ouotrageous stuff near the end was entertaining enough to not bother me too much. I hope so bad they make a sequel to this, this movie is SOOOOO mine on blu-ray when it comes out, day 1 muthafuckas.