Having grown up in an Easteen European city of panelki, I’d say it’s the fact that it only looks decent from high up. Down below between those blocks there’s probably mud with little to no walkways, heaps of trash that no one ever cleans up, broken asphalt and improvised parking lots.
Never mind, zoomed in. This one actually looks pretty nice as far as panel block districts go. But what I said is true for most commieblock areas.

Damn the commies for building housing and then being overthrown by people who won’t maintain the housing!!!