The walrus is stupid and most times cannot cross a bridge. They have just made a statement that they are working on it.
Mostly I don't notice it, If they go walk-about, I jump in the driving seat and sort them out.
The enemy AI can be wicked, the AI of your own units is not so hot, but good enough.
The controls are fine, I find no problems there, and the way it's designed you can access every thing from your mouse.
Even with it's few problems the game is really good. I have been playing it none stop since buying it.