Good MMO's besides Ragnarok?

[Revenant]

There are no good MMOs.

On a serious note, I'd try Monster Hunter Frontier if you can get onto the server.

Edit:

Battlefield Heroes is TERRIBLE. I'd recommend maybe checking out Warsow; it's a free game that emulates Quake, and is fairly good. Fast-paced and somewhat twitchy, however - Takes a while to get accustomed to.