MMOs I've played before:
Phantasy Star Online (One of my favorite games of all time, unfortunately don't play online anymore; don't care for what Schthack did for their server and can't connect to the GC one)
Dungeons and Dragons Online (Eh, boring)
Phantasy Star Universe (Sad the servers went down, another favorite of mine)
World of Warcraft (Played for a while, got back into it after quitting, more then likely quitting for good now)
Lineage 2 (Probably my favorite MMORPG, very grindy, but I love the world, music, etc)
Champions Online (Very interesting, free to play now, HEAVY customization Superhero MMO)
Dragonica (Got bored of it)
La Tale (Akin to Maple Story, a bit more interesting)
Maple Story (Got heavily bored of it)
Dungeon Fighter Online (Think Final Fight, Turtles in Time, Simpsons Arcade game, but in MMO form)
Vindictus (Grapple kills, other then that, was boring)
Gunbound (Classic, very fun)
Shin Megami Tensei : Imagine (Liked it, but it got rather grindy)
S4 League (Very fun, kinda fell out of it)
Rift (Didn't care for it, too much like WoW)
Pangya (ANIMU GOLFAN, very fun)
Shoddy Battle (Pokemon battle/Team builder)
There's a bunch of others, but I'm too lazy to list them all.