I've written on this board before how I think Glee has just devolved into a way to sell soundtracks and cram in guest stars. Even when it addresses serious issues, it seems like it's pandering.
And it's not really "exposing kids to Broadway". It's exposing kids to Broadway shows that are already well-known. Exposing them to Hairspray, Wicked, West Side Story, Les Mis? Totally daring! And most of the time, the only thing the show is exposing kids to is covers of songs that were popular the week before.
If they did an all-Sondheim episode, then maybe I wouldn't think they were trying to just sell CDs as much. But they'd never do that. They'll do another Lady Gaga episode.
"...everyone finally shut up, and the audience could enjoy the beginning of the Anatevka Pogram in peace."