Funny you omit the Xbox360.
What good games does PS have?
Killzone? < Halo.
Resistance? < Gears of War.
Gran Turismo? With it's outdated physics and inferior graphics, < Forza.
Uncharted? Just a knock-off of < Tomb Raider, except with overly cinematic (cutscenes) and a plethora of cheap quicktime events.
Sly Cooper/Jak and Daxter/Ratchet and Clank? (Near carbon copies/synonymous platforming gameplay) Obviously people enjoy these games, so I can't leave them out, and Xbox has no surrogate for them on it's platform.
God of War? (Better brace myself even more) Shallow level-based gaming with little 'world interaction', boring repetitious hack-n-slash gameplay also loaded with cheap quicktime events. < Fable has much more content, is more interesting and time consuming.
Infamous?
The Last of Us looks amazing, but we can't count an unreleased game. Then there's LocoRoco, One Piece (PirateWarriors), Yakuza, Heavy Rain, Wipeout, SOCOM, Little Big Planet, Patapon, PS All Stars, ModNation Racers, etc (not the blockbusters) vs Magna Carta 2, Naruto (RiseofNinja+BrokenBond), Banjo Kazooie, Crackdown, Viva Pinata (YES), Ninety Nine Nights, Fusion Frenzy, Project Gothan Racing, Lost Odyssey, Blue Dragon, Alan Wake, Left 4 Dead, Infinite Undiscovery, and all the Kinect games (don't judge me), etc. It also got many firsts of game series exclusively, such as Dead Rising, Saints Row, etc.
Those are all off the top of my head, but I just searched up this list, which I should have done prior to typing all that out.
The Xbox 360 really has more notable exclusives than the PS3, and if we follow rule of precedent, it should be similar with the next Xbox. It's not even a case of quality vs quantity. All titles are relatively quality... maybe even more towards the Xbox 360, which would explain the doubled software attachment rate in contrast to the competition.
Edit; this list.
http://en.wikipedia.org/wiki/List_of_video_game_exclusives_(seventh_generation)