His comments about the quality of the acting of the current cast and of the recently departed vets are quite astute. Bill comes off as much more professionally analytical about craft techniques than I would have expected him to be. Implicit in his praise for the acting of the cast, though, is veiled criticism of the quality of the writing. What he's really saying is that the cast is covering for a lot of bad writing with talented vamping--and he's right.
You could say the same thing about Year 5, Bill's last season on the show.