I only managed to see some of them 'sing'. It's too early to say who will win but I agree with you about Tricia and Shaun. I like Mel so hope she stays in for a while.
I thought Mel was funny, Shaun sounded quite good but was taking it too seriously. I'm not sure what to make of Tara, her performance was OK but she was wierd in front of the judges. I liked Colin as well.