thats the difference between Davies and Moffat Joe....i think Moffat is nowhere near as good a show runner as was Davies....I thought the episode was okay but not Great like "The Eleventh Hour" ("Hello, I'm the Doctor. Basically, Run!")
I'm also bothered by the whole Clara being freaked out by a new Doctor. She's met other regenerations. This shouldn't be a shock to her.
Final point. This episode was a callback Season 2 story. And Next Week - Daleks! Going for the Daleks already.
I don't know if I'd go that far. I think Davies was carried by the fact Tennant was as good as he was. Some of his episodes were seriously dark. And don't even get me started on Torchwood.