Its probably wrong of me, but as much as I like Nine I get put off by the attitude of CE to the show and the role. I think he was great as the Doctor but sometimes his comments, or even lack of them, just put me off. Tennant for example isn't my favourite Doctor but I love his enthusiasm for the show and I think that is partly what endeared him to so many fans
I've seen lots of people say similar things which is a shame really. He is great as the Doctor but I can sort of understand why people are put off by his reaction to the show, though he has never, as far as I know, slated the show itself, just that he didn't particularly enjoy working on it, which I think is fair enough.