My favorite part of an online game is it's look and feel. I don't like SW: The Old Republic or World of Warcraft because they seem choppy, game-like, and cartoony.

I really like Final Fantasy XI and XIV, in part, because they're fluid and more "life-like" in how everything moves and responds.

On the other end of the spectrum,I also like Ragnarok Online, because it's -that- far on the end of bright and colorful, not quite "too" cutesy, but makes no effort to look or feel like anything but a chibi-fied anime.