On the Halo/Resistance subject, which I'll only hit briefly since it isn't a favorite topic of mine, they're similar yes, but then again they aren't. I've played Halo 1 and 2 and seeing as I bought my PS3 basically at launch I've played Resistance since it was one of the few games out. I'll just say that both are fairly generic shooters, but Resistances storyline was more interesting to me than Halo's to the point where Resistance had enough of a hook to get me to most likely buy the sequel. Considering Halo doesn't really have a story, that's not saying much for Resistance, but all the same I can see why people like the game. Much of the rave and rapture revolving around Resistance, in hindsight, was most likely to due with the fact that it was the preeminent launch title for the PS3 and gave dedicated Sony fans a game they could rally behind. I've already said more than I wanted to, so let's move on.
Currently the PS3's game library is nowhere near the monumental legacy that is the PS2's growing library, nor is it quite on par with the 360's. Whether it be the hardware not quite living up to expectations, difficulty of understanding the developmental architecture or whatever other excuse you want to throw out there, simple fact is it is still early and there are still great games. The problem surrounding the negative perception of the PS3 thus far is this whole childish "console war" turning not only rabid gamers against each other, but also pitting the console makers against each other. It has created this situation where every third party title turns into this eBay bidder war for exclusivity. While I completely agree that a console purchase should be based on exclusive titles, I can't see this buyout of 3rd party developers as a good thing for the industry.
Rant over, back to the games.
As you mentioned both Uncharted and Valkyria Chronicles I feel no need to extrapolate other than state that indeed Uncharted is awesome (barring the "twist" at the end) and VC looks to be a first day purchase for me. Some other games worth mention both out now and forthcoming...
Ratchet and Clank Future: Tools of Destruction -- This is an interesting series, now I had not played an R&C game on the PS2 where it became a blossoming franchise, but after playing the demo I decided to give the game a shot and boy was I pleased. R&C is half platformer half action/adventure with some creative and clever weaponry at your disposal. Some compare the game to that of a Pixar movie and while that is quite honestly a stretch the game does have its own charm and appeal. The game is exciting, fun and humorous which is a great combination of adjectives. Being the type of game that it is you will either like it or you wont there isn't much in between. That being said it is certainly a quality title for the PS3.
LittleBIGPlanet -- No doubt most of you have at least heard of this game. With something around 50 pre-made story mode levels and the potential for limitless user creations it is a game that could possibly never end. There have been several "professional" reviews for the game already all of which praise the titles creativity among other things. Simply put if you haven't heard much about this game you owe it to yourself to do some research. I think one of the most amazing things about this game are the potential uses for this game. During Sony's E3 press conference part of the presentation was done using a level created with LittleBIGPlanet, think of it as being the coolest Powerpoint presentation ever created. This game shows great promise and is definitely worth a look-see.
Other games, well there's SOCOM: Confrontation, which since its release has had some horrid server issues among other things, but if you're a fan of SOCOM, once you actually get in a game it is every bit as good as SOCOM 1 and maybe even 2. Let's see SRPG fans have Disgaea 3, Heavenly Sword was good albeit short, there are other games I wanted to mention, but seeing as it is pretty late where I am, my brain isn't functioning properly, so I'll call it quits.