Nice spinoff, but barely any update in graphics and still overrated
Another story, now I'm not going to rate the multiplayer part, because it's separate and I haven't played it. Now, the graphics in warhead barely updated, it looked a bit better but still not a big difference, single player is still too short, a lot of people loved crysis, now they want more story with more insane graphics, Crytek did give them more, but not enough, I hope they added more storyline into the game so it could twist a bit, because I dont want to keep killing koreans and aliens. Now for the performance part, here's some advice:
Low 8400GT or 3650
Medium 8600GT or 4650
High 9800GT or 4830
Very High GTS250 or 4870
Maxed Out GTX280 or 5870
MAXED OUT SMOOTHLY GTX560TI or 6870
Make sure your rig is powerful enough because if your playing on low, its going to be crappy, but not as bad. I'm looking forward to Crysis 2, it will be the graphics king once again.
Rent it and beat the SP campaign.