One of my customers created something, the bots were really smart.
They was playing together by doing parties, going to bosses and if you even were trying to hit in one of them whole party were attacking you. Party was made with healers and other support classes and assisting each other. In my opinion that guy made the bots to play much better than real players.
The bots were able to do private shops and many other things.
Will be nice if you are able to do such a thing but for sure it require alot of time.