MMORPGs With A Good Thief Class?

In mmos, thieves are my fav class. Love how mysterious quick and stealthy they are but in most mmos ive played, they aren't to fun to play with. So does anyone know an mmo where thieves are fun to play with. Thieves as in a stealthy character using daggers, clause knives or even just a bladder class with dual swords. Just want an mmo where the thieves are one of the top classes like dragonica.