The best replacement for gears of war 2 is halo 3.

The best alternatives to gears of war 2 are rated as following:
★★★★★  halo 3
★★★  resistance 2
★★★  call of duty 5
★★  killzone 2
★★  call of duty world at war
★★  gears of war
★  gears of war 3
★  fallout 3
★  uncharted 2
★  left 4 dead
★  mass effect 2
  fable 2
  gears of war 1
  world at war

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Speaking about gears of war 2, one probably shouldn't forget about lancer.

Other search terms related to gears of war 2 and their ratings are:
★★★★★ lancer
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gears of war 2
halo 3
resistance 2