While Blue Man Group is not exactly my type of show (I gravitate more to Cirque or dance based performances), I could definitely appreciate it and had a good time.
Note: Picking up tickets is a bit difficult- if possible, I'd pick them up hours before the show starts. We arrived at 9:15 and there was a long line at will-call.
As far as the show itself goes, there is lots of audience interaction from the outset- -before the show actually starts, they get the audience yelling out things- and a few bits where they pull "random" (maybe planted) members of the audience out of the crowd and onto stage with them. It is definitely loud- lots of banging, loud musical numbers, and a little strange and messy, but that's the point of it. If you're sitting in the "splatter zone", you'll be given ponchos to cover your clothes. That's a good idea!
I was impressed by how the Blue Men, the props, or the music could make things funny without saying a word. It is appropriate for all ages, and I found that I actually learned a thing or two. Some acts require reading things either projected on/above the stage, or held on cards by the Blue Men themselves. Luckily, the theatre is pretty small so you're able to see things clearly, and I don't think there is truly a "bad seat" in the house.
There were several people who'd seen the show multiple times, and while I enjoyed it, I'm not sure if it is a show that I'd see over and over again.
Some of the acts lag a little bit, and I did find myself getting weary a time or two, but that may just be because we went to the 10pm show. Overall, though, I found myself with a smile on my face, chuckling, giggling, or oohing for the majority of the time. The ending was definitely a fun experience, although your hair might get a little messed up!