I played Autobahn, and did you fix the mountains? For mountains, I usually put impassible invisable objects around the perimeter. Another critique I have about it is that if the game lasts too long, it can be hard to find the AI's buildings to destroy them and win. This is the problem with big maps with spread-out resources. I'm not sure what you want to do about that problem, but it is why I don't play on it.
I like to play long games on Glest. On Autobahn, I was able to create a "control grid" by basically surrounding the enemies with defense, thus besieging them. But after I destroyed the bases, I had a really hard time finding all of the AI's buildings which weren't at the main bases.
//Edit:
Another thing I like to do in general is to defend my main base to an extreme extent. So the more open the main base is, the harder it is to defend. Just looking at some of the screens (I know that's not what you want, but I've got to go to a study group at five) I see some will be really really hard to defend.
The reason I make this critique is twofold. One, I know what it is like to have people not give feedback. And two, I really want you to continue to make maps for Glest. Until you, there wasn't a real stable base of map makers, but you will gain experience and hopefully make great maps like some of the default ones. BTW, my favorite default one is Mountains for some reason...
