Maybe I am way off the mark and please do correct me if I am wrong, but I get the impression that its mostly people favoured towards Germans that have a problem with Americans and Soviets playing together, because maybe they will work well together and actually have reliable and strong tactics / forces, rather than relying on conscript spam pre patch and lacking any proper counter to German late game.
Good start with the post, but yes, here you are totally off the mark. I know its hard to understand it, but CoH2 was announced like "oh this is so realistic" so I see where the expectations come from.
I really understand it btw. It is important that the game lets you imagine you play WWII and not jsut a videogame.
EDIT: For me it is just that USA and Soviets fighting on the same map is ok, in the context of WWII. They were allies, and I can easily imagine that they fought together some missions. Or I see it abstract, the same way I see weopon ranges abstract. Afterall in a Teamgame everyone fights their own territory, and maybe sometimes sends a Mg or something to flank. I have no problem that that depicts the cooperation of the Allied forces.