The best replacement for quake 2 is quake 3.

The best alternatives to quake 2 are rated as following:
★★★★★  quake 3
★★★  quake 4
★★  unreal
  quake

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Speaking about quake 2, one probably shouldn't forget about quake 4.

Other search terms related to quake 2 and their ratings are:
★★★★★ quake 4
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Google Trends

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