Plenty of people care if they're good dancers or not. Plenty of people care if they're entertaining or not.
There is, however, a middle ground which is what, I think, most people look for. Someone that is capable of both.
A conversation in another topic has one of the best examples: Louisa Lytton. She was both entertaining and had the dance ability. Same with Alesha in series 5.
Sadly, in the last few series, we've had very few celebs with a likable personality and the ability to dance, which sort of makes people feel forced to choose which they would rather see: Entertainment vs Technicality.
Like a few others said, we see very little of the celebs on a whole. Even on ITT, they have very short interviews because it's time consumed. I think that's why so many would love hour long ITT's. Still not great, but it would be so much better.
It's an unusual one for me. Last series, I could see Rachel as tecnically great, but the lack of personality I saw stopped me warming to her, which meant I couldn't be drawn enough to vote. Whereas this series, Ali hasn't got the world most fun personality, but I still find myself supporting her, along with others.
People like Jade & Jodie Kidd are the best contestants, IMO. They're rarely the best on a whole, but the imrpove amazingly over the weeks, whilst still maintaining a fun persona that makes people like them.