I just got an interesting email from one of the comics whose email list I am on who didn't make it through to the finals - Sabrina Matthews - and she made a very interesting point after very nicely supporting the show as a great place for exposure for comics...
"Ant, Alonzo Boden, and Kathleen Madigan were there to keep the show moving along, but don't forget, they are "talent scouts" not "judges". When all is said and done, the producers are looking for the ten people who they think will give them a season of the best possible interactions in the situations in which they're placed."
Point being that the producers picked a mix to serve the reality aspect of the show rather than basing the finalists solely on who is the funniest.