I like to see all abilities at the start and watch how they develop. Those (like Natalie) who have clearly danced before and for whom the basics are already there should develop a professional level of finesse and precision, and be able to perform far more technically challenging routines as the series progresses. Sophie started well, but seems to have plataeued (can't spell it, but you know what I mean!!), but Natalie started well and is still improving, and she should be applauded for that. Similarly, no matter how dire Dave is I'd be applauding him if he was improving ... but he isn't!!