Crystal - She cannot do anything wrong. She is a star. Eventhough we all know her indie rock style she brings in some change every week, be it a new instrument or a slight change in the arrangement. She will never do a complete 180 from her niche, but she will go about a 45 this way and a 45 that way to keep it interesting.
Andrew - Oh! He is still in the competition???
Tim - A young, handsome and likable guy singing a classic love song is just plain yummy, though vocally not great. He did not do the falsetto but he did go full throat towards the end which is where he sounds best. But he keeps singing low with a nasal tone which sounds so amateur.
Lee - Probably his best. Still he is a very limited singer like Didi. But who knows he may just coast to victory considering what has happened in the past few seasons.
Siobhan - Good vocal but not great. The switch from the first half to the second half was not a smooth transition at all. Kara is right. There are two voices and she is not connecting them properly (like some other poster said couple of days ago). Siobhan seriously needs a vocal coach to perfect her technique or her talent will be wasted.
Mike - Solid vocal. Certainly one of the top two vocalists in the competition. But Mike has zero charisma. And eventhough he can emote while singing, he does not come across as a deep and thoughtful person. May be he is. But it does not show.
Aaron - Great job especially considering that he was singing same kind of ballads all this time. I liked his performance. But the band drowned his voice. And the judges couldn't wait to trash him, that too after he had just showed his better side.
Katie - Good vocal but not great. Should give her credit for challenging herself week after week with big songs. That tenacity will take her far in life.
Casey - Back to the same old stagnant Casey. Decent vocal. Nothing great. I used to like him in the beginning. But he has become stagnant with the same act every week, except last week.