Bots now:

Defend the throne (as opposed to pushing a random lane up to the river and letting it die)
Push better - melee heroes in particular, they aren't afraid to get their hands dirty and hit creeps.
Counter-push - bots will no longer be pushed back into their own well - or casually last hit as a wave of 30 units comes and smashes through their base.

More to come, this isn't complete as of yet - I'm just putting it up here now so that it isn't in the queue for ages zz :)