I pretty much agree with Xessive's assessment. I put in a couple hours and I am having a lot of fun with it. The shooting mechanics and the way the guns feel are top notch, id definitely delivers on that. The game looks fantastic but it's got those issues Xessive pointed out. My texture pop-in isn't very noticeable on my machine and at first I didn't see it, however doing quick 180 turns around the environment, you can see pop-in for a split second, its quick but you still see it. Also there are some really bad looking textures in just weird spots... I don't know if that is how its supposed to look or shit just isn't loading up like it should but its weird. I haven't experienced any crashes or my character getting stuck on the environment or bad clipping, it just seems to be texture issues. The environments do look pretty fantastic though, there are lots of areas that show off the landscape and give a grand scale to the world. Characters look really well modeled and detailed, and they are well voiced. I even spotted Nolan North's voice talent.
It is too bad however that the world isn't as open and explorable as we all originally thought. Like reviews have read, you're basically taking on one quest after another with the occasional side quest. There is loot, craftable items, and armor upgrades, but its all very basic stuff. id has created a really solid shooter, which is what they always do, and they add some little touches on the side to make it feel like its stretching itself out to be RPG-like, but its not a Fallout or a Borderlands, its a much more simpler, streamlined and constricted version of those. The gun play feels more refined and tightened and its the best looking post apocalyptic game out there. I'm definitely enjoying it so far, I haven't touched the mini game stuff since I haven't gotten too far. I'll post more impressions as I go but I won't get to play more till Thursday night when I'm off.