The main point of the Kickass comics was to shit on the characters. The author puts them through all this horrible stuff because the series isn't about superheroes, it's about consequences. Dave becomes a superhero and loses everything as a result. You can say that it's ripping on all the people that want to be superheroes, and it should, because while wanting to be a superhero is pretty much natural, actually becoming one is stupid beyond reason. Saying that the comics aren't good because they're too bitter isn't good reasoning. They're supposed to be bitter because the entire point is that they're bringing reality into a fairly childish fantasy. The reason that the characters are all stupid is because one would have to be stupid (or suicidal, I suppose) in order to dress up and pick a fight with mobsters in the real world. Now obviously if every comic did that, it would suck, but one comic doing it? Where's the issue? If you want to say Kickass sucks, point out the reliance on shock value, or the schizophrenic tone, but saying "I don't like the comic because it's honest" is just... silly. I'm also not sure where these accusations of racism and misogyny come from. I've only read two works of Millar, but both of them featured strong female leads who put most of the men to shame, and I must be missing the racism part because I'm drawing a blank.
Anyway, good to see the film is alright. I can imagine that there are a few scenes that won't fit in, and that's fine. As long as it makes me want to see Kickass 3, it's doing an alright job.