This has a really interesting structure, both in that it constantly shifts between the Doctor's and the Brig's (and later Sarah's) perspectives and in its combination of multiple genres and elements: post-medieval and Regency historical, Gothic, hard sci-fi, Christian/European mythology, probably more I'm forgetting already. I didn't enjoy it as much as its predecessor, The Paradise of Death, as its dialogue isn't as snappy and it's denser (hard sci-fi is always hard for me to follow, though). But Christian mythology specifically is something I've always felt is underused in Doctor Who – probably to avoid offense – so it's very cool to see it get some use here. The Brig's uncle is a good comic relief character, and Jeremy is still a solid quasi-companion. On the other hand, by this time Jon wasn't always audibly recognizable as the Doctor, and Sarah is a bit weak and imo even out of character in this.