Final Fantasy fans who got upset that XIII wasn't PS3 exclusive always made me laugh since Final Fantasy never was originally a Playstation exclusive; it was a Nintendo exclusive (though whether that was by choice or by necessity is debatable). Square left Nintendo because they, Nintendo, wanted to stay with cartridges a little longer. Had the N64 been CD based, we'd still probably be getting Nintendo based mainline FF games. Moreover: Final Fantasy VII, VIII, and XI were on the PC as well, meaning that the only "Exclusive" mainline FF titles they had were IX, X, and XII and there were dozens of spin offs on other handhelds. So bottom line: Final Fantasy was never "their" franchise to begin with.
So no, the "Exclusivity" complaint doesn't fly with me for at least Final Fantasy, unless brought up in the context "it was announced as exclusive, which is why I bought the PS3". Nor does "Xbox made XIII suck" when the director and producer have said over and over "we made the game the way we wanted".