I realize the game is supposed to be post-cataclysm, but all the brown on the map is _ugly_
It's ugly to look at to start, its ugly on the world map, and its ugly to look at in the innumerable tactical battles that take place on wasteland terrain
I realize that developed land changes later, but I was shocked at the visual difference in the 'new' special tactical battle terrain areas (ashlands, snow, etc). They look good! Like really good.
In contrast, the brown brown brown of the wasteland is mind numbing, looks awful, and its omnipresent, because even late-game, there are undeveloped areas that you wind up fighting in.
So, my suggestion - move the 'brownlands' to a more 'greenlands' graphic, you can justify it with the time passed since WoM, or not, whatever, just make it less ugly 
I actually like the new biomes so much I almost wish you'd use some of them as normal terrain instead of solely within their little mission areas (which are really cool)