The problem with the same races, is that everyone has been there done that! what next they all rally once again and try and defeat the zerg and fail mesierably again?? i dont think so. If that was the case they wouldnt need a new sc game they could just make another expansion set. B/C really who wants to try once again to defeat the zerg it would be the same old sc just new graphics, and a few changed units BORING...