Actually, in the preview, all 3 of the newbies were very unpopular. We thought Hayley was arrogant, Kristina was too showy and that Brian was too cocky.
However, as the weeks have gone by, lots of people have seen threw the characters that they were portrayed as on the preview show. Let's be honest, the producers had to exaggerate to give them more air time. But, whereas more people have grown to like Brian and Kristina, not many have done the same with Hayley. I fail to do so because I feel there is nothing to like.
She comes across as someone who will only be warm, in my eyes, vocal or open if she has any success or is paired up with someone good. Kristina is paired up with John, who's pretty crap, and loads of people expected her to be quite nasty to him or to be quite rude, but in fact that opposite has happened. They have been funny together, she has supported him, she hasn't been harsh on him, and she hasn't been rude.
I haven't seen any of this from Hayley. She hasn't been rude, but at the same time she isn't openly supportive or constructive. She fades into the wallpaper sometimes. If she comes back next year with an even better partner, then I'm sure we would see "the real Hayley" or whatever. But this is the problem. You will never always get the perfect partner.