Thoughts on the musical episode?

While I was familiar with a lot of the actors' singing talents in the past (Barry, Kara, Music Meister from Glee, Joe from Rent, the nerdy guy from Supergirl from Smash, Cisco from some online videos, and Merlyn from everything) it still impressed me to see so much talent in one place. And while I liked the majority of the songs and scenes, the episode felt a little flat to me. Forced. And I LOVE musicals. It was closer to the Buffy musical episode in terms of enjoyment, rather than the Grey's Anatomy musical episode, which was pure perfection.