The best replacement for crysis is crysis warhead.

The best alternatives to crysis are rated as following:
★★★★★  crysis warhead
★★★★★  crysis 2
★★★★  real life
★★★★  halo
★★★  far cry 2
★★★  far cry
★★  far cry 3
★★  battlefield
★  dead space
★  bioshock
★  crisis
★  mass effect
★  warhead
★  cod4
★  gears of war
★  call of duty
★  call of duty 4
★  crysis 2 graphics
  killzone
  crysis warhead graphics
  halo 3
  farcry 2
  farcry
  mgs4
  killzone 3
  bulletstorm
  metro 2033
  killzone 2

Your alternative for crysis is not listed? Suggest!
Speaking about crysis, one probably shouldn't forget about xbox 360 controller.

Other search terms related to crysis and their ratings are:
★★★★★ xbox 360 controller
★★ 8800gt
★ game pad
4870
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Google Trends

Scale is based on the average worldwide traffic of crysis in all years. Click on graph for more.
crysis
crysis warhead
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