I've played it a bit so far. I think I'm near the end, not really sure though. So far I like it. The graphics look great imo, I haven't noticed low quality textures or anything like that. I like how well it runs though, I think I have it on the highest setting (hardcore or something?) and it's running great, with some frame rate dips every now and then though. This is with only a Q6600 and GTX460. I haven't actually checked the fps but I haven't really felt the need to.
Some of the other complaints that I'm reading about I haven't noticed either, like how all the cars are the same. It's just not something I'm looking at when I'm immersed in a game.
There was one thing that I saw that I didn't really like though. I'm sure if you've played the game you know what mission I'm talking about, it was the one where you go on the island and you're expected to play the first bit of it stealthily. Well when I got further into the island, I guess they no longer wanted me to be stealthy because the enemies knew where I was all the time, even when cloaked. They couldn't "see" me and they weren't attacking me, but everywhere I went I was followed by a group of enemies. I guess they felt that the stealth part of the mission was over, and were trying to get me to play the mission the way they wanted.