I agree that Valve has every right to use DOTA2, I just don't think they should. It implies that this is the definitive sequel (because let's face it, people call it Dota, not Defense of the Ancients). Great from a marketing standpoint, but still a jerk move that I wouldn't have expected from Valve. It's not like it's hard to think of other names, LoL and HoN did it.
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**R.O.B.A.Z.O.I.D**