I have no strong feelings about the judges. They've got the 'not all knitters are like Miss Marple' thing going on with TD, and both of them know what they are doing.
I think mohair is quite forgiving. Horrible to knit back if you make a mistake, but minor things like twisted stitches are hidden, and you can use bigger needles because of the hairiness.
I think it's difficult to compare the show with ones like Bake Off, as knitting takes ages, but this one doesn't have an 'angle' of its own, which is where the problems are, IMO. I agree that there is not enough 'educational' content for people who want to learn more about knitting, but not all expert knitters can put their skill into words or know how to teach, so I don't know how that would work, unless they had a segment where one of the judges (or a guest expert) demonstrated a technique. I would rather see that than the group task, I think. Both episodes have featured Intarsia, for instance, and I'm sure a lot of people won't know what it is or how to do it, so it would have been good to see that, and some tips on Fair Isle in the first episode.
I suppose the producers had to decide whether to have an educational programme or an entertainment show.