I've watched a friend play it numerous times and it all seems a bit passive to watch, like he's observing the gameplay rather than interacting with it. Maybe he just isn't very good...
My bro played it for a few months, everytime I saw him, he was either docked in a station, heading from point A to point B, or mining minerals while sitting back watching it all happen.....he quite a bit ago, and has been hooked on World of Warcraft since, which looks to be quite the nice game, alot more interactive then the online stuff I'm playing right now.
Havent played many online MMOs myself, tried a trial of Ultima Online, couldnt get to grasp with how awful the game looked in this day & age (which looked even more horrible in its "3d" mode), got bored after taming 5 cats while running around aimlessly killing stuff, and cursing at the fact all my player movement requires to be verified by the server, which never works well with a bad dial-up ping-rate. Bought Everquest few years back, but never got a chance to play it, I blame it on the 400mb update I had to do on my 26.4kb modem back in that day (38 hours of downloadin an update with that bitrate)
All I play is Final Fantasy XI these days, been doin so for nearly 2 years, I cant really recommend it as it's based upon the use of massive XP grinds which boil down to hitting the few same macros over and over again which as you can likely tell gets repetitive, especially in a non-social party, but then after that all the fun stuff comes when you cap out your level, then start taking part in the end-game activities, which there currently is a crapload of battlefields, bosses & gods to fight.
(my main gripe is that the game isn't very interactable, how many times I wish my character could lay down in a bed, or sit in a chair, subtle things like that)
Guild Wars is quite nice given the price and no monthly fee, but it mainly boils down to doing quests (which soon begin to repeat over hours of play) & missions until you beat them, then from there it is just PvP until the next content/expansion pack comes out.
(major drawback I see is that alot of morons play the game, alot of players dont understand the concepts of balanced teams and teamwork itself)
Plan to head into World of Warcraft here if Final Fantasy XI's next expansion pack (due out soon) doesnt accomplish what I want it to do so (actual solo-content, more end-game events, balance gameplay issues, etc).
(by that time World of Warcraft should finally have its first expansion with some real end-game content in it, from its current look, once you hit its cap {60}, there's not really much to do)