I thought it was ok, and it got better towards the end, especially with the reset of Celie Imrie et al. I dunno, I'm reserving judgement till I see it again because I have a sneaking suspicion I'll like it more second time around. I don't think I was in the right mood to watch it last night.
A lot of it seemed very familiar though, a kind of mix of Partners in Crime, The Idiot Lantern and the library two parter (spoonheads seem v similar to the library nodes- "Clara Oswald has now been saved".)
I'll be back once I've watched it again