From should have put more effort into the level designs. The maps are bad enough as is for human players and it gets even worse for UNACs. I can't even begin to count how many times my UNACs were screwed because of that. There were plenty of times where what should have been a 4 vs 4 battle betwee my 4-UNAC squad and a good 4-man human team turned into a 3 vs 4 because my tank UNAC got stuck in water the entire battle (Ft. Denis), or it couldn't find its way to the combat zone fast enough (Borozniki TS). There's also Borozniki Pollution, where my UNACs lost AP because they walk right into the AP-draining parts of the map, something which the human players I fought exploited.
The only good part of those experiences was learning that my UNACs could do a 3 vs 4 and almost win.