According to Voodoo Extreme VE3D, users multiple forums are reporting that Crysis receives a review score of 98% in the December issue of PC Gamer (US). A post in the Half-Life 2 forum quotes from the PC Gamer review:
Highs: A graphical powerhouse, immersive, open-ended sandbox that encourages emergent gameplay, well-placed storyline, meticulously detailed; engrossing multiplayer, included map editor.
Lows: Alien AI not as spectacular as North Korean AI; enemies can sometimes absorb too much damage; a few minor glitches.
Bottom Line: Destined to be a classic, Crysis is a creative and technological marvel that eclipses every other shooter released this year.
The review mentions the single player campaign takes around 12 hours to complete.
In addition, VE3D reports that PC Action (a German magazine) gives Crysis 9.2 out of 10, which has already been posted in N4G earlier. Please note that these reports and scores are not yet verified.
(VE3D via NeoGAF, Half-Life 2 and InCrysis forums)