After watching that video, here are my thoughts:
Haruka - Thought it was meh.
Makoto - It was ok, not her best song. I think she could have done a lot better.
Yayoi - Alright, and gives the song her own touch.
Hibiki - Great, but that's obvious since the song was 961-sourced.
Yukiho - Pretty nice, but she does go quiet in some parts of the song.
Iori - Somehow, I get the feeling this is what Haruka's version should have been. An interesting change from Iori's style, and I rather like it.
Ami - I actually really like her version, so it was a pleasant surprise.
Takane - Excellent, but that's like saying George Bush was a terrible President; it's an obvious statement.
Miki - Very good, and like Iori's version, her singing style is different than in most songs.
Chihaya - One of the best versions from the 765 crew.
Ritsuko - Didn't like her version very much. First impression was bad, and she sounded like she was forcing herself to be angry while singing.
Azusa - Definitely the best out of the 765 crew, and just as good as Takane's. Azusa's singing style actually worked well with this song.
So I think best versions are Azusa's and Takane's versions, and the worst ones were Haruka's and Ritsuko's versions.
