Leaderboard: What's the best MMO design decision of all time?

Star Wars: Galaxies stormtroopers
Last week we stirred up some discussion by asking Massively readers for their opinions on the worst MMO design decisions of all time. In the interests of fair play, and because of today's peace-on-earth-and-goodwill-toward-men Christmas thing, we thought it prudent to ask for the opposite opinion.

So, how about it? What's the best MMO design decision of all time? It's kind of a broad question, we know, so In lieu of the traditional Leaderboard voting options, feel free to write in your answers.

Ever wish that you could put to rest a long-standing MMO debate once and for all? Then welcome to the battle royal of Massively's Leaderboard, where two sides enter the pit o' judgment -- and only one leaves. Vote to make your opinion known, and see whether your choice tops the Leaderboard!
This article was originally published on Massively.