I don't know exactly who said it. It could have been a protagonist who came to this realization after going through a series of challenges and learning lessons about the futility of revenge.
One reason it stands out is the detailed world-building and the unexpected turns in the plot. Also, the character development is really well done, making you root for the protagonist throughout the story.
It depends on your taste. Some people love it for its unique art style and interesting storylines. But if you're not into certain genres, you might not find it that good.