I don't mind old blocky graphics at all, especially if it's running at 120fps at 4k :)
It's part of that uncanny valley thing I guess, the more graphics have improved, I find humans in the games look more ridiculous. Though something like dishonoured gets this right, the characters look more like paintings rather than an attempt to look totally real.
Frankly speaking, I find it difficult nowadays to go back to the old, blocky early 3D games. Except for Quake, I will always love Quake.