My friend has it, I've never played it though. He says that while the game is good, the community isn't. Meaning that if you aren't like the others playing the game, or aren't what they're looking for, it's no fun for you. Example: He had a Red Mage. No groups look for Red Mages because they are 'useless' until they get a spell called Renew at level 40. But after a while, he became 'useless' again when nobody needed that spell anymore due to having large MP pools already.
He also likes to complain that everything has to be done with a group. You can't solo (well, you can, but it's not worth your time, etc), so you're stuck getting a group, which relates back to the first thing.
But, like I said, I've yet to play it, still want to, most likly won't.