There are actualy 3 games which makes me thinking of upgrading my system for a DX10 card: Crysis, FSX and PT-Boats...
Well I have an opinion, and only an opinion I must say because I did not personally purhase the game, but I have played it via Dx9 from a friend of mine here in my town, and that game is
Crysis. However I have three other on-line gaming bros that have Dx10 systems and have completed the game, along with "some" multi-player. Well since the November's release, 2 have removed it from their systems, and the other has left it on, but he has a 1TB HardDrive as well, "but just wants to have it available IF he one day wants to play it again out of boredom".

(His exact words, BTW!) They say, IF you are "solely" into awesome visual effects, which can only be brought to you by Dx10, then Crysis is your game. However IF you are into a story driven & atmospheric game that draws you deep into the action, something like Half-Life or HL2, then the game falls flat in those regards. And I can say the visuals in Dx9 are good, and I concur on the 2 levels that I played out, but it was just not that immersive to my taste. They also ALL stated that the multi-player was good, and there are players, but the game-modes were nothing different than playing Battlefield 2142, with way lot better graphics.
Sorry if I was a little OFF topic, but I just wanted to pass that on to you about Crysis. Read the reviews, get
other opinions, and read the "
user" opinions OVER the so-called "professional" ones. Those from the leading publications, on-line and in print, have me personally thinking about their motivation behind a good score, when they are receiving advertising money from that games publisher. Sort of "makes you think a little these days".