Games series that most likely never would of came into being without playstation....
Tomb Raider
Resident Evil
Silent Hill
Tekken
Dino Crisis
Blood omen: legacy of kain
Twisted Metal
Suikoden
Wild Arms
Persona
Arc The Lad
Armored Core
Air combat aka "Ace Combat"
Final Fantasy VII
Final Fantasy Tactics
Grandia
Alundra
That's all of the ones that I could find at the moment. I agree with the op though.