There are also a few popular game series which have exclusive contracts with game systems. Sadly it looks like the new Resident Evils and Metal Gear:Twin Snakes are on Nintendo. That bites cause they were GREAT games. The kind that changes how games are made. The previous versions are on PS2. But well.. I would really love to play them.
One series with incredible graphics and gameplay is the Final Fantasy line which is exclusive to PS2 I think. I'm not a fan of roleplaying games. But this is something I have had alot of fun playing. FFX was really good. I like Soul Calibur2 alot, but luckily that is on all three systems. And its dropped down to about $20. It is probably the best fighter game to start out with. I love it and I don't even like fighter games!