Python was used for EVE Online and Toontown Online
Sorry, but Toontown? Really?
You should stop looking at the visuals of the games (or whether you enjoy them or not), and start thinking about the architecture.
Toontown is a MMORPG that must support tons of players at once participating in different events in a 3D world (that was launched in 2003).
Minecraft (launched the online component in 2009), though more to your personal preference in terms of gameplay, supports a much smaller amount of people in a block-based world. And Minecraft still has (last time I played) entire chunks of the world that go missing from time to time that hasn't been resolved after three years.
Toontown is a greater feat of engineering (even though you may not like it's design). Both games could've been programmed in either Python or Java, or any of a dozen other languages.