What made FF11 community special was the fact that server populations wasn't much larger than a small town. Which meant that if you acted like an idiot it wouldn't take long before you were blisted by the entire server. Once that happened...well you couldn't level, do any of the storylines, or get endgame gear. Thus you had to make an entirely new character and do everything again. Which can take up to a year.
So basically both the game mechanics and the players enforced good behavior. Now...well leveling is so easy in both games that you can just hit level cap in a few days. So there's no consequences for when you act like a complete jerk.