Believe gambling comes second to the shows for myself as well. Usually go out to Vegas for a couple of weeks each year, and ensure we have at least 7 shows pre-booked ( and yes, why is it the weeks we go that there are very few headliners showing! ).

For my money, after the Blue Man Group, I would recommend We Will Rock You, full of life and makes you leave with a smile. Also, speaking to several people it seems that the play was re-written with Vegas in mind slightly, changing some locations etc etc.

Found the cirque de solei shows very samey, "O" and Mystere were all well and good, but does make me wonder how many ways they can come up with twirling people across the ceiling.