To Say Nothing of The Dog is, I think, a more successful book than Doomsday Book. Connie Willis does better at nineteenth-century farce than at fourteenth-century drama. That is, I find myself wincing less often when Willis is not attempting to describe matters medieval.

Still, as (I believe) thistleingrey pointed out once, there's a major problem with the whole setup, namely that no Oxford college could ever change its history departments in such a way that they rely solely on time travel.