Sorry
But on the topic though, I guess so? Like, the Russians and Germans are usually labelled as the bad guys in some movies and they're always either soviets or nazis. Though, that's so less in historical movies, so I may be inferring your post wrong :/ And it's like that with the movie Gallipoli, too where the Brits are portrayed as bad. These views sometimes make me uncomfortable, but otherwise it doesn't bother me so much.
I'm doing a paper on Cromwell. Pretty swick stuff, but I'm a lover of history. But I agree with the history is written by the victor thing.