Mogdred was a indeed a fabulous "new" introduction. Even though a lot of the rooms were the same as Series 1, having a major villain to prowl around and threaten teams added a new dimension. I remember being really scared when he made his "Play a while..." comments to Team 5.
I thought there were also a lot of interesting deaths this season. The turning to stone of Team 3 was nicely done, and Ariadne webbing Team 9's exits was, well,
nasty. I also liked Treguard's reaction during Team 8's ordeal without the divining rod. He really sounds like he's enjoying their slow starvation. The Treguard whose motives we're unsure of is really good to watch.
Oh, and one I'd rather forget:
Team 6 - enough said.
Hmm. I've actually always enjoyed the truly awful teams, though this season I preferred Team 11, with the lovely attempt to offer Lilith an empty jar of humbugs.
As to what I didn't like:
Combat Chess- it didn't really work for me.
Casper The Key- tops my list of annoying things across the whole 8 Series on the "Grrr" thread. Though, if the Reach wand had been given a similarly annoying high pitched voice...
"Sometimes of the Grey, but always of the Green, dearie. Shurrup Brollachan! Have you seen Festus, my dear? I need to take him back to Cornwall. " [cackle]