MMO Fan :
Everyone forgets about Crysis 1 it is after all a more demanding game than it's console ported drivel Crysis 2
You call
this drivel?
http://www.youtube.com/watch?v=CmupVG1uPoU&list=UUZXSZdGb3Su8RvR5QuRyeqw&index=1&feature=plcp
Anyway...
OP: I currently own or have played a wide range of demanding PC games, including Crysis, Crysis Warhead, Crysis 2, ARMA 2, Metro 2033, Battlefield 3, Skyrim, Gears of War (PC), etc...
I would have to say that the most demanding, as well as the best looking, of all of the above would have to be...
Crysis
2.
Yes, it's original DX9 release on PC put a lot of people off. After all, even the original Crysis (which came out 4 years prior, mind you) was a DX10 title. Crysis 2 vanilla looked great, that much is true. But, it just didn't really cut the mustard for a lot of people. It didn't look quite as good as the original Crysis, let alone a modern sequel. DX11/High-Res/MaLDo Texture mod/Blackfire's Mod changed all that.
Now, Crysis 2 is not only better looking and more demanding that the original Crysis, it is the best looking, most demanding game ever made up to this point.
Crysis.2.is.King.
'Nuff said.