I'm surprised theres so much hate for Derek/Derek and Maria here. Firstly - he's far and away the best dancer and choreographer on the show. And so the final will be the poorer without him. Sure, perhaps he is given an easier ride by the judges than some (theres no denying that "jive" was brutal) but then they have never been fair or consistent with anyone have they? Besides, it's hardly his fault.
As for him with Maria - she's the most improved of the celebs and has had some of the most memorable and best dances of the season. Again, it's true at times she has been given higher scores than she has merited. But they all have, in particular William who has seen the least professional and vulgar "judging" that any contestant has ever had (from Bruno).
Katherine too has been rather lucky with scores of late.
As for the final, William seems a nice bloke but is rather stiff and generally looks to be concentrating very hard. There is little performance value from him. Cheryl I find very cold and I fully expect her to be very cynical and exploitative in what she will give him. She will surely win and although he won't have been the worst dancer to do so, the manner in which he has been shoved down our throats by the show will leave a bitter taste.
Katherine for my money wants this all far, far too much. I found her recent meltdowns father tough to watch. And the longer she has been in the show, the more nervous about it all she has become - and her dancing has suffered as a result. She is the best dancer still, so it's possible she could bring the wow factor. But I expect her to finish 3rd.
Donald seems to think he is better than he actually is. He is competent, with a decent level of performance/drama but technically unremarkable. His partner, a fantastic dancer seems perhaps the weakest of the 3 pros for choreography.
He will likely be last from the judges but his fanbase will see him 2nd