Well, I bought and played R&C to death. IMHO, it's a great game, with tons of humor and replayability. (I spent a lot of extra time tracking down all the hidden items and I've almost got all the plans for the super-weapon.) Although the graphics are cartoonish, I spent an awful lot of time just marveling at the bizarre, creative, beautifully rendered landscapes.
I also bought Heavenly Sword. As much as it pains me to say it---since some of the programmers have been such wonderful contributors here at Beyond3D---I was disappointed. The graphics were absolutely beautiful, both technically and artistically, but, for me, the game just didn't play well. The writing and acting were uniformly very good, but I found the melee combat to be awkward and unrewarding. On the other hand, the ranged combat was quite fun, and I felt the "aftertouch" control using the Sixaxis was innovative. Unfortunately, when I was done with it, I couldn't help but think that I would have gotten more out of replaying God of War II.
Uncharted is next. I plan to pick it up this Saturday.
The only other retail game I have for my PS3 is Virtua Fighter 5, which has entertained me for hours. (The Virtua Stick High Grade is awesome, BTW.) I have been enjoying the downloadable games, though. Super Stardust is fantastically addictive. Everyday Shooter and flOw are also great games.
As Josh's original question, why do people own a PS3 if not to play exclusive games and/or watch BR movies, well, I have a PS3 only because MS apparently didn't want me to have a functioning Xbox 360. If the 360's hardware quality were equal to the PS3's, then I would be playing Mass Effect right now. That said, I don't feel that I have to purchase mediocre PS3 games just because they're exclusive. If Call of Duty 4 is the best game on the PS3, why shouldn't I buy that over an exclusive, but lesser game?