Huh, I already liked this video
And yeah that's true. He used them as slave labor to a certain extent (it wasn't near as efficient as paid labor so that's interesting too).
I would say though, that just because his top priority was killing the Jews, gypsies, etc., he still wanted to win the war.
So yeah, that's a good point, and he definitely wasn't one of the greatest military leaders of all time, but he's definitely not as bad (militarily, he was morally terrible) as a lot of people are led to believe.