Finally got another solo game of Root in tonight and played with the Duchy for the first time. (Played against the Electric Eyrie & Automated Alliance).
They are so fun! I can not wait to play with them in a multiplayer game. However, I'd definitely make some adjustments the next time I played, because I won pretty handedly. I would definitely include the Marquise (because it was almost impossible for the bots to attack my buildings, which is key to defeating the Duchy), and or one of the cards that makes the bots harder.
Overall, so glad I got it out and can't wait to try it again. (PS I'll share more photos below.