Most ppl used to shootem ups..they jus wanna have fun..if u want gameplay CRYSIS will offer u variety . COD4 does have some variety..shich is forced (u dont have a choise) but not to d xtent crysis does..its still jus a war game but more intense.
To actually enjoy crysis u will have to be innovative ..use diff combinations of ur nanosuit along with the things in d environment n u will c how amazing d game play is..d problem is dat most ppl play crysis like any other game..jus go n shoot d enemy down..if u want diff in game play be innovative.
As for gfx..cOd4 has good gfx ..but still not on par wid crysis. (at max details)
u also have to remember dat CRYSIS does a lot more dan jus gfx..
jus look at the physics , the level of interactivity , huge open levels (initially), partial nonlinear gameplay...so it does a hell lot of more processing dan COD4 ..so ppl who think dat CRYSIS is taxin ,jus think again.