You do realise there's a forum for GTA topics right?
My bad. It's not really displayed like any of the other forums, so I guess I missed it.
I feel like Los Santos was the most polished and well planned. I almost feel like SF and LV were just bolted on last minute...
Road layout in LV is crap.
For me, my only problems with LV's roads are in the top right area of the map where someone decided the railroad needs walls, and they put roadblocks and shit for some random reason.
The desert area of LV is great, but the issue with it for me is the size. When I first played the game, they take you from LS, to SF, to Tierra Robada, and then to the airstrip, and then to the city, and with that flow of the missions, it feels bigger than it really is, and once you're done with the story mode, you end up noticing how tiny the whole area is.
Look how far away Area 51 is compared to LV, and then how far the other cities are compared to LV.
Also, SF Bayside is a tumor, and the map could be less of a square in general.