A quick run through.
-both entrances from spawn are right next to each other
-all 3 chokes (right outside of spawn) start and nearly end at the same height, are about the same size, and function nearly identical to each other.
-lack of sightline cover on mid. It's important to create very distinct sight lines, especially on mid. Think above and bellow badlands mid bridge, low ground and high ground on gullywash, even the hill on viaduct works as a sight line blocker because you never really want to stand in the middle during a mid fight.
-scaling and ramp incline on most of the map
Every entrance should act as a unique path for players. Some should end on high ground, some should begin, some should lead to chokes, others to open areas. You want just as much strategic variety as possible so combo has a reason to push one choke over another. Ask yourself: are there 2-3 unique paths for the combo to push from area to area? If they push on the left do they end up in the same place as if they push through the middle? You want as much variety as possible.
By the way maps in the map pool are by no means perfect. Figure out what works and what doesn't.