I pretty much agree with all that, B. I didn't include the, for want of a better word, presenters in the list, as I was looking at the guys who played more than one part. But, all three were excellent, especially Hugo. Let's face it, not many people could get the fluffy little Cavernwights over as highly dangerous, bloodsucking demons, but thanks to Mr Myatt's reactions, they are still frightening today.
Mark Knight was, and most probably still is, a highly versatile actor, who brought to life some fantastic characters, most famously Lord Fear. Although, I think the reason there was a greater understanding of his Fearship over Mogdred is that Lord Fear was firmly introduced as THE main bad guy, and the quests revolved around defeating him and his forces. Whereas in the earlier series' defeating the dungeon was the main goal, and Mogdred was just a very dangerous character who would pop up from time to time. I agree with your sentiments about John Woodnutt, he had a brilliant presence and gravitas about him.