There's one behavior I noticed that, in my opinion, should be reduced.
In the first few turns, enemies tend to rush the Skyraider or whatever transport you have, clearly treating it as the mother of all covers. This behavior is very easily exploitable because they tend to stand in the same spots each fight, which, coupled with a decent transport, could allow your troops to kill them and go back into the safety of the transport.
Not only that, but it doesn't seem like the AI realizes those spots are heavily dangerous. Perhaps makes the area around the transport a no-go zone for a few turns?