PS3 exclusives are often much better than 360 to PS3 ports.
Best launch games Motorstorm and Resistance: Fall of Man.
IMO most impressive games of 2007 in general: Ratchet & Clank: Tools of Destruction and Uncharted.
Best and most impressive PSN games: Super Stardust HD and Warhawk.
Good multi-platform efforts do sell well on the PS3, look at Call of Duty 4 and Assassin's Creed. Some games got delayed compared to 360 releases, some were quick and dirty suboptimal ports. For multi-platform owners it's not strange to get a 360 version of such games beforehand.