Bad choice of song. Taken out of the context of the show, the humor is completely undermined or lost altogether.
I'm not really sure who they're trying to appeal to here. The people who already know and love WICKED aren't going to need any convincing to see it again, so song choice is irrelevent in their case. The people they should be targeting are the ones who haven't seen or heard of WICKED before, in which case, they should stick with the big 'trademark' numbers like DG or Popular. If I'd never seen the show before, I'd be a lot more jazzed about it after watching one of THOSE numbers, not 'What Is This Feeling?'
I think the performance was fine, considering they were under blaring TV studio lights . Theatre stage lighting adds SO much to a scene, and not having that "atmosphere" can really sap the energy from a number. And of course they're dealing with a much smaller space than they're probably used to.
"Word of advice: Be who you are, wear what you want---just learn how to run real fast." Marc, UGLY BETTY