It is psychology in it's self that has you ask that question, why would people complain? First they think about the best voice actor they have heard in a game and asume that every game needs to be atleast that good, they already have
preconseptions on how they want the Death Knights voice, and if it doesn't live up to there standered then they are not happy. Same goes with every other aspect of the game...(and that's just the first part of the Psychology^_*)
There's more...it could go on and on and on...
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