Kaiba expresses childhood loneliness, the guilt we feel towards our parents when we feel like we don't deserve their care, and has an amazing story attached to it. I feel like people only think it's overrated because they're not dissecting the psychology behind some of the events that take place, and I really wish they would overthink about this show just as much as I did. The style of the anime is also amazing, I really love artistic styles. I sobbed so hard after I finished it that I think i popped a blood vessel in my face. Why do you want a longer review,myanimelist? I'm not trying to sell this anime, it's an experience like no other, you should not have to read someone elses' opinion on it to watch it.