I love the shows onboad. I usually go straight from dinner to the showroom to get a good seat down front. I sometimes see both the early and late show.
If you spend much time in Vegas you'll find that the typical Vegas show today differs so greatly from the old school productions that new cruisers might be confused by the comparison of shipboard entertainment to Vegas.
I like the t*ts and glitz style that was the Vegas norm during the rat pack years. Few Vegas shows today would fit the definition of "Vegas style production." The top shows in Vegas at the major hotels are now Cirque du Soleil shows or are in the cirque style.