Wow that is a difficult question to answer because it depends on the type of games you enjoy. Do you like first person shooters? Racing games? Or, do you like role playing games (RPGs)?
The top RPG games for a PS3 include the Mass Effect franchise, Skyrim franchise, Dragon Age franchise and the Final Fantasy franchise. Mass Effect is a science fiction based game where you travel across the galaxy. Skyrim is an open world fantasy game. Dragon Age encompasses various time periods over the continent of Thedas. Finally, the Final Fantasy series is one of my personal favorites. If you like to fight using swords and magic, you will love this game.
If you like racing games, the top games include Gran Turismo, Need for Speed and Burnout series. Gran Turismo uses dirt and asphalt tracks where you can race some of the best cars and top tracks around the world. Need for Speed allows you to race in cities while avoiding cops. Finally, Burnout is a racing battleground.
Many people love first person shooter games. The top titles include Call of Duty, Resistance and Killzone. The Call of Duty franchise features a campaign mode as well as online action. Resistance is a huge shooter game where the world is overrun with aliens. You must save yourself and the world from the alien invasion. The last franchise is Killzone. Killzone gives you online multiplayer competitive first person shooter game.