That episode was absolutely
amazing. I might even say that it's the best episode of the entire Moffat era and one of my favorites of all time.
1. The acting was magnificent. I think it's safe to say that Coleman is the best companion actress of the entire revived show. Capaldi was great as usual, and Williams has once again portrayed Lady Me really well.
2. The writing was nothing short of breathtaking. Ashildr was delightfully grey in this episode. Clara's
final scene with the Doctor and the Raven
was also amazing (but that goes without saying).
3. The score was great. This is one of Gold's best so far.
My rating: 40 out of 10. More Sarah Dollard for next series please.