I have also played with bots recently, and I have found that they can actually add a good amount of depth to the game, but it could be a lot more if not for these problems: (mainly siege)
-Bots cant interact with any of the objectives (cant break down doors, open gates, or raise ladders also cant pull down flags)
-Bots when told to charge will run into the castle wall, even if there is a ladder raised they will seldom climb it unless following a PC.
-Bots do not have the ability to is the siege tower on castle three as they can not jump so they cant get on it.
-when a bot does not have a shield they seldom block (just noticing) as if they were equivalent to a Single player novice fighter.
-there are also certain objects the bots just dont see and thus get stuck on.
These are just some of the main problems I've had with bots in siege mode, and I am guessing with a little tweaking Bots could be an awesome part of this game as there dont seem to be the same lag problems as before (we were playing with 40 bots.)
Lastly, the formation thing would just be eye candy, if you need them to form up do it yourself, if your not there that means they dont have a commander who would be necessary to put them in formation IMO at least.