He's getting a lot of stick elsewhere but I'm glad some have noted his performance. In comparison, Le Coq and Xhaka are very different players and I believe that's what some people's gripe is with Francis, especially as Wenger is starting him over Granit. They expect a passing wonder class as well as the defensive work.
Hard to truly give him a place in the team, when ideally you'd like to see Xhaka at the base of the midfield/whoever else/Özil. I think as time goes on, we'll see him being used like a utility player, coming on and causing a ruckus. The final 20 minutes in a game, the last thing an opponent wants is a rabid Coquelin nicking them every time they touch the ball. He has the legs and pace and the combative nature that can be used for the 'closing up-shop' sub we should use more often to protect a lead.