I'd heard several critiques that the dialogue was plodding or wooden which I don't think is true - in particular I think lots of the stuff with Ryan and Graham has been well written. But I heard the criticism recently that the dialogue doesn't quite deliver the necessary punch and I think that has been a problem with the season, there at least a couple of instances of perfectly good (or at least perfectly Who-ish) ideas which I don't think the stories have quite sold and its plausible that that is a dialogue problem.