I hated the pop culture referencing (Arthur Dent, Lion King) and the awful, I may be paraphrasing,True that is bad but i'll always put Xmas Invasion at the bottom. The problem I have with it is that the Doctor is too inactive in the story and the umpteen time Rose blubs about the Doctor changing. 11th Doctor was the right way to start a new Doctor off
'This is a fighting hand!'.
Just a very bad line, very badly delivered.
Just my opinion mind