There are bugs to be fixed that were found in the demo and reported by people on this forum, and JMM has mentioned here that the Grand Tactical AI isn't quite finished. JMM has talked about releasing an updated demo as well.
Currently the GT AI only sets up the original battle plan. Imagine what it will be like when it reacts to your movements. Solo games will be much more difficult then.
Because of the sophistication of the rest of the AI, the GT AI won't be that hard to finish.
We are really very close now. Hang in there, keep the faith.
Hook