As someone who only watched this because I was waiting for Doctor Who I can say from not having seen the previous episodes that it seemed geared towards the curly haired girl (Jessie?) winning.
Jodie (who I know from The Biggest Loser) was fine as far as I could see. The second one on, slim with dark hair, got a rubbish song she could do nothing with in terms of becoming "Nancy". Then this one came on and she was very Bonnie Langford.
At the end Jodie gave a very good speech as to why she wanted to be Nancy, the other two kind of waffled.
I saw the very end of the very end too and while waiting to hear I thought the curly haired one looked a bit manic, very serial-killer eyes! Only kidding, well, not really, she did have this forced looked on her.
If people don't like who won I would assume the easy answer is not to go and see the show and if the people running the show didn't want a particular girl then they shouldn't have let the great unwashed do the picking. This is why I don't watch these shows...except for Britains Got Talent