The best replacement for team fortress 2 is counter strike.

The best alternatives to team fortress 2 are rated as following:
★★★★★  counter strike
★★★★★  call of duty
★★★  counter strike source
★★★  half life 2
★★  counter strike go
★★  monday night combat
★★  gotham city impostors
★  planetside 2
★  call of duty 4
★  team fortress classic
  blacklight retribution
  quake wars
  battlefield heroes
  unreal tournament 3
  borderlands

Your alternative for team fortress 2 is not listed? Suggest!
Speaking about team fortress 2, one probably shouldn't forget about garry mod.

Other search terms related to team fortress 2 and their ratings are:
★★★★★ garry mod
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team fortress 2
counter strike
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