The best replacement for dota 2 is league of legends.

The best alternatives to dota 2 are rated as following:
★★★★★  league of legends
★★★★★  hon
★★★★  lol
★★★  league
★★★  smite
★★  starcraft 2
★★  diablo 3
★  dota
★  heroes of the storm
★  lol better
★  lol graphics
★  dota 2 test
★  cs go
★  tf2
  path of exile
  dota 1
  lol more players
  heroes newerth
  hon heroes
  starcraft dota

Your alternative for dota 2 is not listed? Suggest!
Speaking about dota 2, one probably shouldn't forget about alan.

Other search terms related to dota 2 and their ratings are:
★★★★★ alan
★★★★ steam download
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Google Trends

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dota 2
league of legends
hon