Whilst that is true, in 12 months we've seen what I would class as one good, solid exclusive game. I've said on here several times that I think MGS4 will be massively underwhelming, Gran Turimo 5 will be great, FFXIII will be another not as good as VII and VIII, LBP looks boring, HOME is interesting and that the only AAA exclusive that gets me REALLY excited is God of War 3 because that will be awesome.
Though I hope to be proved wrong, past efforts from those game series lead me to believe it's more of the same with efforts four, five and thirteen from those games.
A lot of Xbox360 games do go PC though, but Xbox360 still has Dead Rising and Project Gotham Racing and those are 2 of my favourites ever. It has others, but Dead Rising and PGR are absolutely stellar.