I watched the show last night, I didn't mind it, apart from the bit where they destroyed the stuff at the end. That person looked genuinely upset, and I know she met Ronan Keating and got tickets for his show, but she still looked devastated for her stuff to be broken. They just seemed nasty in the way the were stamping on it and stuff.
I actually found Chris to be the one far to over the top and exaggerated. Rosie made me laugh with a few of her off the cuff bits, and did seem quite natural. I'd seen the comments here about the singing at the end I was preparing to cringe at that, but I didn't mind that in the context too.