Sony:
Any FPS they have done. I think my total cost in playing the Killzone and Resistance series is $10 due to finding them in dirt cheap dollar bargain bins. I found them to be all right, but the genre has never appealed to me.
Outside of that the big one is Gran Turismo. I am not a car guy, and just like simple arcade fun. I tried 2 & 3 and just could not get past the licenses and realistic physics.
I would have listed Infamous until last month because I loved the third one after not being crazy about first one.








