One thing to remember that even the amount of accents in the voice talent pool is not necessarily a problem for all armies, considering that there seems to be a randomizer function in the basic engine (Charge! Courage! For the King! Etc.! all from the same button.) At the time, there were quite many first- or second-generation immigrants in the US, and Germany had Volksdeutsche, Hilfswilligen, Osttruppen, SS foreign volunteers etc.
Also, now half of the voice clips sound like they would come on the radio (ENEMY UNIT SPOTTED! ENEMY UNIT SPOTTED! EXTERMINATE! EXTERMINATE!) and half like they were really shouted. Sometimes, this does not feel fully consistent (your SL standing next to you speaks to you via radio?). Would it not be more logical that Commander commands to SL would play out as radio calls, and vehicle crews would sound off only radio calls, while infantry would actually always shout them.