Like all of my luck, I got into the Uncharted 2 beta, and been trying it out for the last few days. It is a pretty sweet experience.
One thing before I start, having a mic on the Ps3 seems to be a special occasion unlike XBL (I mean it comes with the console).
That said this game is pretty sweet, there will be comparisons to Gears of War with the main difference being what is mapped to the A/X button. In Gears its your all purpose roll/dodge/roadie run button in Uncharted its your jump button. So I feel that the characters are a bit slower in Uncharted but you get a lot more mobility in exchange for that.
Many of the stages are built on multiple levels and that gives you distinct advantages in some cases, but not always.
Like today while playing, I discovered it is possible to toss somebody off of a ledge if your hanging on it, I did it purely accidentally, but the kid I did it to started freaking out, he thought it was so amazing.
It also works the other way though while hangin there you are kind of an easy target, sure you can shoot and stuff but you don't have much mobility nor cover so.
And right now there are two modes in the game, a capture the flag-esque mode called Plunder, and Deathmatch. Nothing really special or different done with them.
One call thing I also found today... well used for the first time, are throwable exploding barrels, I set one up in a narrow tunnel and when an enemy came running through just blew it up in his face.
Reminds me of the other thing, like Halo you get medals that you exchange for money at the end of the game to buy stuff. So that exploding barrel got me a medal called BBQ.