I went with a 2. I think it might be unfair to compare this to a standard episode as it was made as a Christmas special which usually follows a different formula and it also had the trouble of introducing a new Doctor, so comparing it to other Christmas specials I have to say this is probably one of the weakest.
I read that this was a bit of a last minute commission so I guess they didn't have a lot of time to develop the story and after the issues with Series 1 I can understand why it perhaps didn't come off as well as it could have, but personally it's not a favourite of mine.
How long winded was that!