kick-ass was also based on a comic book. in fact, compared to most comic book movies its a very accurate adaptation
But Kick-ass is a comic for comic book haters ;-)
You could also enjoy Watchmen then. Also another looks at (super)heroes. Allan Moore (the guy who also wrote V for Vendetta and Batman: The killing Joke) did a phantastic job writing this. It is as deep as a novel and there have been doctor thesy for psychology written about the characters if I recall correctly.
The characters are just so flashed out and play into the hand of guys who donīt like superheroes.
Even made the time list of the 100 greatest novels of all time.
There also is a movie of it, which did not do a bad job exactly, but its one of this things that you canīt really reach at all, at least not in one movie. Two big issues though: A) the ending has been changed for the worse B) the casting for the villan is a disaster
Anyone who likes comics and graphic novels really should give that one a shot, it is the absolute kind in my mind.