Heh, funny how thread resurrection happens. And now that I've got a PS3 and Uncharted, I can finally weigh in on this.
In a word: awesome. The game is just really cool. I've put a few hours into it and it manages to more or less be everything it claims to be. First you're Tomb Raidering across a cliff face, enjoying the scenery, getting immersed in the world, then you're gunning down marauding hordes of jerks en masse ala Gears of War, ducking for cover, shifting position, and popping in and out of line of sight the whole time (and waiting for your health to recharge after you've gotten a bit shot up). Oh, and you can only hold 2 weapons and grenades, also like the latter game.
And while this stuff is cool, I'm actually really enjoying the story and characters. The main guy is one of those cool under pressure types, a bit flippant, generally funny, and *almost* annoying... but the voice actor pulls it off well and the writing is just good enough that he stays likable and consistent. This isn't super cerebral stuff, but it manages to stay a few steps ahead of corny while still being generally humorous. Add that to the heavy adventure theme and you've got some classic stuff that just brings out the kid in you. Well, if the kid in you wants to slay hordes of modern-day pirate creeps.
Anyway, this is a great showcase for the PS3, but it's also some good, clean fun. Idol's going to love the hell out of it during OWmeet, I can see it already.