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Still, if a game launched with a declared focus on group-play it could be a succes. I dont see why not. Just dont try to advertise it to be something it's not.I know it's not the same, but games like DOTA and LOL or even CS and TF2 are succesful games with near zero singleplay fokus. I just cant see why it wouldn't be possible to make some sort of crossover mmo with a game like that.
It's not the same to me mainly because of the lack of RP. When i read mmo i think of mmorpg's. Basicly i'm looking for more of a rpg in a dedicated multiplayer setting.