World of Warcraft may be the biggest MMO around, but you don't have to take it on to succeed. Cryptic, the folks behind Star Trek Online, certainly feel that way. Said Executive Producer Craig Zinkievich:
And he's perfectly right. Every time a new MMO comes out everyone goes "it'll never beat WoW," and dismiss it out of hand, judging it a "failure" should it not hit 12 million subscribers. What really matters is that the game is great enough to make everyone the money that it needs to keep it that way.
Speaking as a player, Star Trek Online is very different from WoW, not least because it's full of Star Trek goodness. Now, if you'll excuse me, my Borg character has some star clusters to explore.
STO Don't Need No WoW Players [The Escapist]