Nope, they neglect to shoot at units and buildings all together. But they love shooting low priority stuff.
The day before yesterday I experienced an enemy ACU which my static tier 2 defences didn't shoot at at all, except when I issued the command manually. And the awesome trick with the engy target swtich of my ACU as mentioned before I also experienced.
I would like to understand this. Am I doing something wrong or missing something? I mean, these problems should be obvious to everyone, at least I would think.