It is very annoying for player waiting during multiplayer games, or even game match made, it sends you to advanced AI level game or just end of the others game, or worst breaking of connection due to the others players connection status. Sometimes, I just want to play a quick game however the waiting time is more than playing time....
After some random click, I found that it is possible to play with AI only by skip matchmaking (you may know it already), it is really helpful for someone who experience the multiplayer game matchmaking takes too long, or the above situations. However, the drawback is the EXP earned is relative lower, the companions AI are weaker (as well as enemies's). Anyway, if you are going to finish the AI order, or want a quick game, that is the simple and quick way.
Start the game with player vs AI, select settings
You can switch the matchmaking on and off in this screen.
Please watch the video if the above is not clear enough.