I've been thinking about that myself, and while i can't come up with a specific reason, i think it has to do with the article on newsarama i read about all the extreme heroes of the nineties. Deadpool came out of that time, and the fact that he's a mercenary is probably one of the big reasons. I don't care for guns, so any mercenary type would be a big negative for me. Plus, his healing ability while fighting off cancer, making him somewhat unpleasant to look at makes me kind of squeamish. I just don't get the appeal of characters like deadpool, or venom. oddly enough, I've never had a problem with Wolverine, though.