Well I just saw it, not literally enjoyed it. What I like it's the fact that he used similar color palettes. Makes me think these are all happening inside the house in last panel.
Actually I didn't enjoy it. It's cold, there's no illusion of any type of emotion here. It's basically just a picture. If I tried to squeeze one feeling from this it would be numb. There's a difference between art that inspires you to sadness or joy and something like this. Just because you can paint something someone will recognize doesn't make it impressionable. If this were not Hitler's work it would've been lost along with all the other hundreds of thousands of mediocre atists that just couldn't cut it.
Morality wise yes. Advancing technology, science, military, and today's world not really. He caused horrible things but in the end good at times can come out of evil. I'm not defending Hitler all I'm saying is without him the world would be a very different place.
Plus, these paintings are quite dull.