That was not a good idea, I agree. He would be better as a commentator on a Roller Derby show.
Why? Those who watch Roller Derby probably have even lower IQs than those that watch MNF. The only reason I watched last season was for Miller. And as someone that watches his show regularly, while this particular article isn't from Miller, he is usually quite right of center
The reason Dennis didn't do well on MNF is because his jokes require an understanding not only of what the 22 fat guys chasing a piece of dead pig around are doing but of history and geopolitics as well.