If you have well equipped characters, you can make it through legend runs with your bots.
I like to run as Merc Kruber w/exe sword with BH Saltz w/a&f & crossbow IB Bardin w/dw hammers & crossbow, Unchained Sienna w/flame sword & conflag staff.
On my Kruber, I also run all of the team buffing talents (paced strikes and defense increase on shout ), and I also run the proxy, while the bots run decanter.
Alot of the killing of the chaff, elites, specials, and monsters will fall to you. However, Saltz and Bardin are your snipers of specials with the crossbows. Bardin and Sienna are your crowd controllers. Don't 100% rely on them and it will take a few attempts for you to get the feel of what they are capable of and what they arent.