Don't forget Warhawk, please. Lots of people around here love that game.
Other than that, I know what you're saying. But I will say that everyone ADORES R&C, and it's plenty long enough to justify a purchase. As I said before, I believe any avid gamer should have Heavenly Sword in their collection simply because of what that title achieved. Uncharted: Drake's Fortune comes out in November, and don't forget about God of War III next year (in addition to MGS4 and FFXIII, which you already mentioned). White Knight Story is another one I'm really looking forward to (it's Level 5's PS3 RPG), along with Disgaea 3. Oh, and Unreal Tournament III is going to be awesome, regardless of when it comes out...and not only will it arrive first on the PS3, it should be better than the 360 version (just a guess). Also, this year we have Haze exclusive to the PS3.
That's a few to chew on, but again, I do understand the viewpoint. The PS3 is an expensive system, after all. At the same time, with all the games right around the corner and the recent price drop, I'd like to think this is a great time to pick one up.