I thought the first song he did was definitely more his style. And the song Jordin did by Aguilera wasn't. She had no oomph in it. Great voice, but she couldn't really bring it.
Personally, I was pretty underwhelmed by both contestants. Simon summed it up best. Blake, as a performer, was decent, I guess. Too gimmicky for me. If you're not a strong singer, then I prefer you be at least a strong musician. Like Prince. Doesn't have a great voice, but he's such a strong musician.
Jordin has an ok voice. Powerful, but she still sounds like a little girl. And when she tries to bring range, you can hear the strain sometimes. Then she ends up sounding like she's yelling. As a pure singer, she's better than Blake, but I would take any of the past Idol winners over her.
And I agree Aikmaniac, Daughtry was great. Truly enjoyed his performance.