i think kotori and the president got enough focus, considering they are only secondary characters in a show with so many main characters.
In general i can only sign what has been said here, the character focus was too uneven (poor Yukiho)
In genereal i liked the show, it wasn't outstanding, but it definitely caught the spirit of Idolm@ster.
But where the show imo was outstanding are the emotinal moments. Not just the sad ones, but also the happy ones (like when Chihaya regained her voice on stage due to the support of the others). I can't remember a show where i had wet eyes nearly as often.