In order to adequately speak about balance issues, they should include these maps in automatch and bring up a quick survey afterward.
Narva River
Fun map with 3 good combat zones (island, village and northern right side) the middle island can be somewhat of a mess when there is too much units around. Based on google earth, which is nice
Overgrowth
Nice ambiance, simple and enjoyable.
Lember Fall 1944
This would make a nice 3v3 and 4v4 map. Balance seems fine. Middle zone is quite fun because of the multiple angle and cover around the church.
Karelia Summer
This one might have too many chokepoints, thanks to its unique design. Tanks battle can be hilarious on this one. Beautiful map. I appreciate MonolithicBacon contribution with coh community.
Pink Marshes
I love pink marshes, it has been my favorite custom map since it's been released. Great ambiance, great design, lots of swamp and red cover makes for unique firefights. Well thought out.