Well, actually, the trouble I had with the game (and why I basically quit playing) is that I had trouble finding people to play the game with. Unless you join a guild (and in 200 hours of playing, I never got an invite), you basically have to form random pick up groups to do missions. Which gets harder and harder as the game goes on. Near the end of the game (well, about 80% through) I just couldn't find any groups (looking an hour or more), so I quit.
In theory, you can do most missions with the AI henchmen, but in practice, the AI is stupid, and unless you know what you are doing, they don't help much.
The player vs player stuff is somewhat flawed as well. It can be fun, but it's spoiled by people who exploit the system. Ie, getting better armor than they are supposed to have for their level; elite skills (ie, more powerful skills than they should have); and unless you are in a guild and are prepared to do a lot of practice, it's not something you can really be competitive in.
And in the time I played, not once did I ever see anyone acting in character. I'm not sure if anyone does that in MMORPGs anymore, but I was somewhat disenheartened by it.
Though don't get me wrong, I did get 200 hours out of it, which I considered to be a great value. So I think it's worth buying. But as an action RPG, not really a MMORPG.