Quote Originally Posted by Gazius
Do darth formations actually improve anything for the AI? Or are they just different?
Darth Formations make the A.I. perform better on the battlefield by optimizing the way it positions and utilizes its units. Don't expect spectacular improvements though: the actual A.I. routines cannot be changed.

Incidentally, the EB team have made their own historical formations. I don't know if they have been optimized like Darth's are, but they are performing pretty well in my game.