Argh, I can't stand Azusa's song. Too much "kyuns" =/
I find a somewhat similar issue with Iori's in that she says "idol" a bit too much in the same verse, as if trying to declare what her job is.
I do like how they didn't cop out for the Futami Twins and actually gave them individual songs. Clones, they no longer are.

!
I'm starting to warm up to Miki's song lately. Voice could be better, but its grown on me.
Now when can I hear more of Yukiho and Hibiki? Those are just excellent!