I figured posting this here was better than reviving the Meguru single thread since it hasn't had life in a while!
Anyways, I downloaded 3 of the girls (Airi, Maimi, and Saki) closeup versions of the Meguru PV, and wow... I think out of these three Airi is the only one who had a smile on her face during the entire song! I know in the making of, after her recording was done, you could tell her mouth hurt from smiling so much. Maimi's was basically pretty boring, and Saki attempted to smile, but it just made her look like she was about to cry... I know this isn't a big problem for Airi because she's in half the songs they do, but you could really tell Maimi and Saki were trying to bite back singing along to the other parts of the song they weren't in.
On a side note, I'm actually pretty interested to see the other 4's versions to see how they do. I know it'd be hard to sit through an entire song and look semi interesting, but still, they could smile or have some expression on their face...