I adored this episode. It took it a little while to warm up, but wow, it packed such a punch in the end. Last week I felt just like you did - that Mark Gatiss had tried to write a Moffat ep and failed. I didn't feel that way about this ep, though; I felt like Tom MacRae did a really good job of taking set-up that was clearly all Moff and making it his own. So much really amazing character work. I'm still sort of reeling.