It would be cool to have another race, but wouldn't you need more units per race to counter the exponentially growing number of strategies you create? And if you don't need more units; thus keeping the number of possible strategies the same, what is the point of adding the 4th race to begin with?

Anyway, I think the heroes in War 3 significantly dimished the value of all the other units and I sure am glad there's none in multiplayer starcraft 1/2.

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Slash 'em good my boy!