Top Free MMORPG games

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I have played alot of free mmorpgs and some have been great and others very bad. The one i think was the best i have played is FlyFF and also Maplestory. I tried DOMO today and i didnt like it at all. What do you guys think are the top free mmorpgs out there? and which ones have you played and liked? Do you think mmorpgs are a waste of time?