Ratchet and Clank, Jak and Daxter (if they decide to make another game...), Uncharted, LBP, Motorstorm, Warhawk, Heavenly Sword (yeah, yeah, its either you love it or you don't kind of thing), SOCOM, Valkyria Chronicles, a game doesn't have to be big to be a good exclusive. Also there's the casual games like Singstar and Buzz.
Just because a game isn't exclusive doesn't mean that you can't play it either. Sure, FFXIII isn't exclusive, but you can still play it. Sure GTA isn't exclusive, but you can still play it. Sure DMC4 isn't exclusive, but you can still play it. Plus, there's all sorts of goodies on the PSN. Don't leave just because these games are going multiplat.