I unfortunately don't have time to read through everything that has already been said so this might already been said...
Anyways terran Ai dose not repair buildings, you can go in and damage a building to critical level, leave his base and it will burn to the ground.
AI for all races seem to have problems dealing with cloaked units. You can almost always walk into their main with Dark templars and kill off cc, nexus or hatch. I've seen that they will build some detectors later on but it's way to late in my opinion.
Anyways terran Ai dose not repair buildings, you can go in and damage a building to critical level, leave his base and it will burn to the ground.
AI for all races seem to have problems dealing with cloaked units. You can almost always walk into their main with Dark templars and kill off cc, nexus or hatch. I've seen that they will build some detectors later on but it's way to late in my opinion.