I suggest adding almost all (except some extremely unplayable) maps from cRPG files to the rotation, and possibly adding even more maps to the files. Certain maps aren't the problem - it's that the rotation is repetitive, and even the best maps get boring after a while. With great diversity there wouldn't be such a problem - you'd very rarely think "oh, this boring map again". Even the bad maps would become fun to play once in a while, because they'd be played rarely, and more as a non-competitive refreshment. The mod is slowly dying anyway, so why not have a little fun? It's not like the competitive side of the game will get hurt, as it's practically non-existentand rightly so (except for some tryhard 2h heroes).
Unfortunately the admins are very conservative when it comes to the map rotation. I bet 10 stones that all of them have a big sign that says "NO FUN ALLOWED" above their screens.