Having now seen three Cirque shows, it's easy to see why Mystere is so highly rated, it's fantastic.
From the hilarious antics of "Albert Einstein" in the 15 minutes before the show started to the grand finale, it was a spectacular experience. There were several times where I wasn't even sure where to focus my attention, there were so many amazing things going on. Humor, intrigue, and a touch of sensuality combined to make this a phenomenal show. If you can see just one Cirque show, see this one--ticket prices are cheaper than "O" and it's a more intimate theater.
My only issue is that the narrative could be stronger as it's not easy to discern what the show is really about--yet that didn't detract from the experience at all!