1) It happens quite often to give an order to a transport, to go to a certain location. For some uknown reason it decelerates or stops (especially over mountaintops), completely ruining your plans. Even if you want to distract your enemy, they slow so much to obey your orders, that the enemy will eventually see it; Is it a bug, or it can be bypassed somehow?
2)When they unload units, it takes them so long, that even if you manage to survive the route to their destination(quite a feat against a worthy adversary), they will die easily there , because they sit like stupid(here I am, kill me!) before unloading units.
Is it a bug or it can be ,managed with some manouvre?
3) The same clumsiness is observed when you want to load units. The whole process (load-unload), turnes out to be such a pain, that people will avoid to use them, which is sad given the interesting strategies that can be applied with them.