I really cannot think of any MMO that's not a "grind". You "grind" for levels, you "grind" for gear, you "grind" for in game currency, you "grind" quests or special events." In essence any game mechanic can be considered a "grind" because it's technically a waste of your time for simple amusement or an unusual event that fills one's time. I suppose I could go a step further and say reading words (within a book or on a digital screen) is a "grind" as well. Even daily life could be considered a "grind"; although variety and the choices we make can diminish one's attention away from such details.