I think he wants to be (altohugh maybe Humphries more than Paxman, he is that little bit more reserved), but the most recent episode is the only one where I've seen him chair a debate convincingly, and his interviews usually end up with the interviewee getting their point heard more than Mitchell really taking them to task. I think as the show goes on he's coming into the style more, but he's playing catch up with the rest, who after that first shaky episode have really stepped up the the plate.
In this grand illusion of entitlement to life / Our 'need' is a mask for our greed and it's not right /
We are executioners who parade ourselves as kings / As selfish and deluded as the blood-bathed Bathory. ~Kingdom, 'Bathory' xVx