City of Heroes
Along with its counterpart, City of Villains, CoX was a long-running superhero MMORPG that offered great character customisation and, unlike certain industry-leading MMOs, actually encouraged character development and roleplay. As a game that actually began before WoW, it dodged the modern sinkhole that is trying to be "a WoW killer"; it's unlike any MMO I have played or heard of (for starters, NO GEAR). I wish I could tell you to play it, but it was mercilessly executed by NCSoft in 2012, despite still being successful by any reasonable measure. NCSoft are dicks.