Map voting.

[Kaasovic]

Or how about make all maps playable instead of always destroying the good maps and make bad maps good. 

This would require a legion of mappers with dedication to keep them updated. Something NordInvasion is lacking at the moment.

That doesn't address the first part ("destroying the good maps"). Somehow, the contributors find time for that.

It's just a poor attempt to balance the maps I guess. It is hard to set standards in a branche that is so divided.

Setting and publicizing a measurable set of well-known standards (defensive areas, kiting routes, time for a wave to travel to various areas, etc) would be a good first step. A lot of changes seem very arbitrary.

Those are already publicly available. However everyone has their own mind when it comes to finishing touched, that in some cases might ruin a map, or make it (too) easy.

I don't want to talk trash about the mappers, because it kinda is a underappreciated job.