Cities: Skylines - Content Creator Pack: Modern City Center Review (Foggy Seoul)
The wall-to-wall commercial buildings only look good in a very particular set-up: straight streets in a box grid. If there are any curves or you have misaligned boxes in your grid, the buildings will also misalign in a grotesque way.
This matters because the inner walls of the building are total blanks. Just smooth concrete. It looks wrong, and requires frequent work-arounds, like plopping trees, to block out the ugly.
But the thing that breaks it is that there are missing buildings -- for example, no 2X2 growable. This means you will have empty spots that never grow, and you have to fill them with something else that won't fit in properly.
4 out of 10. The aesthetics are nice, but the problems are so annoying that you'll rarely use this pack for a district style.