It's a strange one, as I loved episodes 1,4 and 5, thought 3 and 7 were ok, hated 2 and 8 and was just a bit bored by 9 and the Christmas Special (which is really episode 6). Definitely more episodes this series that I've disliked compared to the past few series.
Going on my ratings in the scoresheet thread, it averages out at 6.94, but that is slightly distorted by the 9s and 10s I gave to Asylum, Power of Three and TATM....
So I voted 6 in the end.