Hi,
would like to make a suggestion, to start campaigns with open range maps. Not with tiny ones like Jungle.
Free City would not be the best choice, too. Here GDF has to squeeze through small doorways.
The "warmup" argument does not count. As I saw it, Jungle today was a totall mess, only fun for GDF slaughtering Strogg while they are running uphill.
This continued in the minecraft map, no "gg"s from the players. But maybe here the unbalance was a problem as well.
Cheers,
Krish