The best replacement for killzone 3 is crysis 2.

The best alternatives to killzone 3 are rated as following:
★★★★★  crysis 2
★★★  resistance 3
★★★  black ops
★★★  halo reach
★★  killzone 2
★★  bulletstorm
★★  killzone shadow fall
★  halo 4 graphics
★  battlefield 3
★  crysis 3
★  homefront
★  socom 4
★  killzone 4
★  halo 4
★  call of duty
★  dead space 2
★  gears of war 3
★  killzone mercenary
  crysis 2 graphics
  shadow fall graphics
  crysis
  brink
  dragon age 2

Your alternative for killzone 3 is not listed? Suggest!
Speaking about killzone 3, one probably shouldn't forget about playstation move.

Other search terms related to killzone 3 and their ratings are:
★★★★★ playstation move
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killzone 3
crysis 2
resistance 3