In the dwarf section of the questline you had to choose between two kings.
When the game was finished the epilogue however revealed the consequences of your choice.
If you choose the 'good and decent' king, he turned out to be weak-willed and stuck in the past. Under his rule the dwarves kept being stuck in past glory and sank further into obscurity, unable to adapt.
If you choose the 'evil and ruthless' king, he turned out to be a great reformer. Despite having to rule with a hard hand, he took the dwarves into the future.
But, yes please.
No more disney morality as in Oblivion. It was jarring, at times laughable and very, well, lame.
In real life, evil is not defeated by good. Evil is usually defeated by a more organised kind of evil.