some people actually like oka river? 
Personally I think it's a terrible map cuz of the frozen oka splitting the whole map in 2 halfs. You cannot easily help your team if you are on the other side of the river.
Winter maps are nice as long as they have as few as possible frozen seas imo
I completely agree, Oka River Winter and Rzhev Winter are terrible maps because the ice seperates portions of the maps and disallows flanking and rotating (unless you want to risk your tanks getting oneshot through the ice). They would be much better maps if the ice was removed imo.
I'd also like to see another revamp for Lienne Forest (and Winter variant) that opens up the forest more. Vehicles get stuck on every one of the 1000 trees (south side mostly) and the forest lanes discourage flanking. Some lanes (like the river from the south base) look wide enough for tanks but actually aren't. The middle area should have more sight blockers or cover I think. The red cover rivers everywhere should be removed as they are too punishing. On the south side there should be some tweaks so the retreat path from the station doesn't take squads through the forest. MG spam is super hard to counter, especially as OKW. It might be very interesting to make some of the dense forest sections actually heavy crush so late game tanks and heavy explosions can clear the forest.
The last revamp did a good job making the town and middle sections of the map pretty nice and I enjoy playing there, but the forest remains a pain to play in. I feel like instant /L 'ing whenever I get the forest spawn.