In answer to Mr_Burrows.
I have Glacier excluded. I absolutely despise that map and I can give you reasons.
1. I am a TD player. The suitable TD perches with cover/concealment are useless in terms of view range and being able to hit enemy targets. I don't think I found anywhere I really liked on either side.
2. SPGs. Although I don't play them that often, I never really found a suitable location that was safe and able to hit either of the two main brawling points. The central ridge means that the aim area is elongated and unpredictable,
3. Scouts. Useful, but see above. No use spotting for TDs and SPGs that cannot hit anything.
That leaves MTs that brawl on one side and HTs that brawl on the other and it can be possible to support the elevated track with a TD, but the long and short of it is, although I had some really good battles here, most went on far too long only to end in destruction and loss. And, no. I don't think I need more tinfoil, I absolutely hate it.
I had a hard time choosing between Glacier and Ensk, but while I despise Ensk, battles are over so quickly, either for me or everyone, that I decided I preferred to block Glacier.
Currently, with some free Premium time (mission rewards) I have Berlin also blocked as I am as certain as I can be that I have lost between seven and nine battles in a row here recently.