Obviously WoW is the most popular MMORPG of all time, but let's take a look at some other good PC MMORPG titles on Steam that are great alternatives. This list has been voted on by other PC gamers, so rest assured that the titles at the top are some of the best MMORPGs you can play on Steam.
When you're feeling a bit nostalgic, Steam has classic MMORPGs that started it all like EverQuest II and Neverwinter. Star Trek Online or EVE Online are space MMOs where you explore the universe alone or with a crew. Fight crime and supervillains in the superhero MMO, Champions Online. Protect average citizens in the massive multiplayer tactical shooter set in plagued New York City, Tom Clancy's The Division. Take on convectional MMO gameplay and try out Foxhole, a new indie strategy MMORPG, where you are continually trying to win a never-ending online war.
Don't see your favorite PC MMORPG? Add the game to the list so other people can see it, and vote it up or down.