The Old Who fans like me will have been delighted by an origin story for, of all Old Who baddies, the Great Intelligence, in such a way that it All Makes Sense (apart from Downtime, of course).
And Moffat is on form, killing off poor Jenna-Louise Coleman again, and then giving the Doctor the quest of finding out who she really is - a neat contrast to the question "Doctor Who?" which of course we know we will never get fully answered.
Though I don't think it is nice to mock anyone for their appearance, even Sontarans.
Must get on with cooking boar and sprouts and rosemary apples followed by Christmas pudding, but am very satisfied.