I saw Blue Man Group at the Luxor in February of 2017 with a friend and her teenage daughter. I was able to purchase tickets for 50% off as a Las Vegas local, and would have been disappointed with the show had I paid full price. Even at a discounted rate, this is not a show I would attend again.
The theater itself is very small, we were seated in the 5th row and I think we would have been just as happy sitting further back.
The musical parts of the act were quite good, but some of the "comedy" sketches were just too stupid for me. The younger children in the audience seated in the rows in front of us seemed to enjoy the show from start to finish though, so perhaps I am just too old (or I was too sober)?
If you are in Las Vegas with young children (not teens) this would be a good option for you if you were able to get discounted tickets. For all others, I recommend passing, there are far more entertaining shows you can see for a comparable price.