PvPer? PvE lover? Are you all about the raids? Are you in it for the small group content? Achievement grabber? Battlegrounds dominator?
What drives your passion for MMOs? Massively usually puts this type of stuff into more catch-all terms, such as "PvE player" or "PvP player" but they want to know exactly what pulls you into MMOs. No more of this beating around the bush and talking about large swaths of content.