As an academic of more than 25 years, I can state with certainty that you cannot place too much weight/reliability on student evaluations. The presentation/teaching element of such is but a small portion of the overall 'opinion' that students provide.

Written statements reveal their varying deep displeasures with everything from seating, lighting, lack of (or too much) technology, class size, and textbook costs to lectures that are simultaneously too fast and too slow, too easy and too complicated, and too abstract and too practical....and they include cheeky/rude comments on the lecturer's clothes, shoes, haircut, voice, on-stage antics, and whether he sang or danced.

I'm quite sure Geoff will know exactly who his Empire audience will be (mostly Bay St. types, I presume) and he will prepare and deliver to suit their overall profile. I know I'll be watching on Roger's TV.