Personally, I hated Angel Exterminatus.
People often claim that one of it's virtues was the portrayal of Perturabo and the development of his character. I actually disliked his portrayal and kept imagining comic book scenes when he was accompanied by shield-bearing robots wherever he went. His portrayal in The Crimson Fist got it spot on for me, just a shame it wasn't continued in the same manner.
McNeill surely has a mountain to climb to redeem himself.
Heresy's Background FAQ. (Fluff Project)
I do love how we don't even need CotE to comment anymore, chances are he has already said something intelligent before that can be re-applied to the current situation.
CotE Reviews: Prospero Burns (HH Review)
, Age of Darkness (HH Review)