I'd have to say "Crysis" is one of the best PC games I've played. I only played it once and for about half an hour, but the graphics were amazing, and I loved the nanosuit abilities and customization options. Now, if I can just remember to use the half hour I still have left of playing the game, I can use those general tips for playing FPSs I got and not fail so badly by running out of ammo after the first real combat mission...
Sorry about the double post, but I forgot to mention that "Crysis 2" is coming out in November, and also for the consoles! This is important because people can now finally experience "Crysis's" minblowing graphics without the annoying side effect of having your wimpy, low tech computer exlode in your face. Oh, and Half Life 1 and 2 are both awesome as well.