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Estimates of Diablo III + the expansion (a $40 retail at launch) put it around 20m copies. That is a massive success IMHO.

Diablo 3 + expansions is the 12th best selling video game of all time.

https://en.wikipedia.org/wiki/List_of_best-selling_video_gam...

That list plays with numbers in very interesting ways that aren't very useful. Not counting digital sales (uniformly), you end up with stats from an arena that doesn't really apply anymore. Notice LoL isn't on the wiki or Kritika Online or any of the actual massive successes (active users or net profit or ARPU) in the industry.

IIRC, it was the fastest selling pc game of all time. That's quite a success.