I love playstation too, what are your favourites games?. Did you try Medal of Honor Underground? That's the one I'm playing right now, it's pretty cool although I try to play it when my son is not around because there is too much shooting.
Just for the record the "3D" Category should be FPS (First Person Shooter).
I have to go with FPS by quite a bit. My website is a gaming community for FPS games so it's a given Counter-Strike, SOF, Tribes, Unreal Tournament, BF1942
RTS (Real-Time Strategy) would have to be next.... Empire Earth is awesome, Starcraft is a classic, as is Red Alert.
Xtrasweetgirl mentioned PS2...I enjoy that too although I don't get to play much these days. Favorites for the PS2 were Dynasty Warriors 2, Grand Theft Auto III, and Maddan Football...then again, those are the only games I have for it.