The best replacement for age of empires 2 is age of mythology.

The best alternatives to age of empires 2 are rated as following:
★★★★★  age of mythology
★★★★★  starcraft
★★★★  civilization 5
★★★★  rise of nations
★★★  empire earth
★★  warcraft 3
★★  age of empires 3
★★  civilization 4
★  rome total war
  stronghold crusader
  age of empires online
  empire earth 2

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Speaking about age of empires 2, one probably shouldn't forget about conquerors expansion.

Other search terms related to age of empires 2 and their ratings are:
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age of empires 2
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