I really enjoyed the show. There wasn't much of the percussion/music like they had in the past, but the performances were still funny. It's hard to go in with an open mind, but I think you set too much expectations you might be disappointed.
The show is very family friendly. The performers really try their best to engage the audience and I love that they walk around trying to find a "volunteer". The finale was the best part of the show. The audience really participates and their encore performance was exactly what The Blue Man Group stands for (the whole paint and drum thing).
Yes, their performances are different than before. It's more comedic with a variety of skits, but they also try to incorporate music. Performing arts isn't just about music - it includes skits, plays, instruments, and everything else related because it is as stated: performing arts. If you want that Nick Cannon drumline action, maybe this isn't the show for you. They try to incorporate different performing arts into their act so if you're expecting The Blue Man Group you saw on YouTube, maybe you should rethink your ticket purchase.