Agreed. It's clear that the owners have considerable financial resources, but seemingly no one thought to hire an interior designer/architect to consider how the place looks or functions outside of the gaming aspect. If that's their style, then more power to them; it just seems incredibly generic and like wasted potential.
If you read TFA you will see that the house was architected by his father, an accomplished architect.
I used to work for a firm that did custom homes for wealthy clients. Even when we paired them up with designers some of them just preferred a very plain appearance.
That said, I thought the games room with rows of hide-away PCs looked like a call centre or at best a 90s internet cafe.