Something I like to do when I pick up a new game (that's already been out for a while) is ask all of the veteran players what's kept them playing (or coming back) after years of playing.
Hopefully this is the correct place for this sort of topic! There's no need to sell me on the game, as I've already purchased it, but as a veteran player of other online games, I know how a few simple mechanics or quirks can keep a game interesting for years.
Answer however you like, but here are some ideas if you're drawing blanks:
Thanks to anyone who takes the time to respond, I like to get an idea of what the good, the bad, and the awesome of a game with an established community before I jump in, that way I know what to expect!
- What are some mechanics or gameplay systems you find really compelling?
- What is it about the game world that keeps you interested?
- What makes Guild Wars a unique experience (in it's genre) for you?
- What about end game, PvP, what makes those experiences unique/compelling?

That and I love smack talking in JQ, I demoralize my enemy physically and verbally 
