a lot of casual gaming occured on the playstation consoles but i don't feel like sony had much to do with it. listing off the most important games that brought new gamers into our community (imo):
super mario bros.
sonic
tetris
pacman
pong
DDR
guitar hero
wii sports/fit
grand theft auto
i can't think of a single game made buy sony that really reached out and grab the attention of new gamers.