4 Guys From Viewpoint came up with the concept, and it's simply brilliant. Here's an excerpt:
Hitler[AoE]: cool, i start with panzer tanks!
paTTon: lol more like panzy tanks
Roosevelt: o this fockin sucks i got a depression!
benny-tow: haha america sux
Stalin: hey hitler you dont fight me i dont fight u, cool?
Hitler[AoE]: sure whatever
Check it out here: If WWII was an MMORPG
This concept, of course, fits in nicely with Godwin's Law (wikipedia explanation below):
As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one.