Haha, totally get this.. and it is something that I really drew to love and be fascinated with when I got into my pre-teen years. I was just a little wimpy as a kid and preferred the more fantastical and mysticism of VIII. Just get something that gels best with your kid. As I said, if I had a kid, I'd get IX and play through it together through multiplayer.It's funny that you say that because that darkness and cynicism is what enraptured me as a child I think.
It's also probably why I was really into Batman The Animated Series.