I’m not a gamer and I avoid using any games at all on the iPad and iPhone, but I do think that the best games are the ones designed for the platform ... and that’s just me observing it “at a distance”.
I don’t play too much of them either, at least not many hours upon hourse of them with two children, and my job as an electrician. I just have an old ipod touch that I got as a gift, and when I browse the app store, I see the games that played on XBox 360, such as Bioshock, and realize that this must be a powerful product line to play that game on such a tiny device, at least in the new generations.