In these days gaming industries have to step up their game to show they are the best and you should buy their console and ignore the rest of consoles in the immense gaming industry. To do this industries such as Sony, Nintendo and Microsoft make games exclusive for their respective consoles (PS3, Wii, Xbox). Each one of them have several exclusive titles but there is always one only title that makes them be "better" than their competition.
Nintendo has obviously the Mario Bros. series which they explode in ways we almost always enjoy, because I mean, who doesn't love to jump in order to complete missions to save the princess with our childhood's best virtual friend Mario?
Microsoft has Halo, a game that is so popular around the world that some people buy an Xbox just to play this specific game.
Sony has Killzone, a game that is similar to the Halo series but this one has obviously a different story and it's just available for Play Station.
As I mentioned before these games are like the TOP exclusive games they have but they have tons of other exclusive games and in the link below is a chart that shows the best PS3 exclusive game of the year, enjoy!
http://www.thesixthaxis.com/2011/12/29/game-of-the-year-2011-playstation-3-exclusives/