I think episode 6 of Idolmaster dropped my respect for Kyoani half a notch - I think Ryuuguu Komachi's performance beat anything K-ON (either single or multiple exclamation point version) put together. I keep thinking about the Thelma and Louise wannabe music video from K-ON! and it's not a flattering comparison. A-1 Pictures did, to be fair, cut to reaction shots and a brief conversation between Ritsuko and The Producer to save key frames, but still a pretty amazing effort.
I wasn't all that impressed with Idolmaster at first, but somehow it's become the series I watch as soon as I'm able to once it's out. Ryuuguu Komachi's costumes are much better than the outfits in the opening credits though, my 2 1/2 year old has more fashion sense than the OP, and this is someone who would wear a Halloween T-shirt with a pumpkin on it every single day if her parents let her.