This is why several people don't like it:
https://www.coh2.org/guides/46183/guide-to-competitive-map-making
TL;DOpen:
-Water: "red cover must be used economically". It could also be heavy snow, in this case mud.
-Hedgerows that smartly divide the map
-Minimum height differentiation: The game engine does not handle elevation well
-Wide front-line due to smart territory placements
-No dominating building
-Be open: Do not cluster up too much and provide lots of access ways.
-Last but not least: Do NOT place fences in front of the bases!
