An interesting concept indeed, but 3 things:
#1: I would never play it.
#2: The game would probably sell about 70 copies worldwide.
#3: Fox News would have a field day with it.
I like different characters, and I'm a little tired of the rugged vengeance seeking handsome male stereotype as well, but a character who is a pedophille wasn't exactly what I was thinking.
I was thinking more along the lines of protagonists like Caleb or Francis York Morgan. Caleb is very clearly insane, and while he's also driven by the revenge motive, the twist is that there is no day to save. Everyone Caleb cares about is dead, including himself, and rather than grumbling and being heroic, he laughs maniacally while he murders everything in his path, completely indifferent to whether his victims are gun toting cultist psychopaths to innocent bystanders.
Francis York Morgan, on the other hand, is a different type of hero. Mainly, he talks to his imaginary friend, he reads the future in his coffee, he interprets his dreams as facts, he likes to talk (usually to himself) about 80's horror movies and punk rock, and he has the social skills of a penguin.
And yet, both of these characters are loveable, simply because of how different they are. Caleb's insanity or York's... peculiarity seem a lot more believeable and interesting than a handsome space marine heroically saving earth from generic alien species #456.