Definitely entertaining! Madame Tussauds is a damn good time!
There is a plethora of amazingly well done wax figures. Even though a few figures don't look like the real counterpart, most look freakishly real and I love how you can interact with them. You can curl up with Hefner, dunk with Shaq, and join Dean Martin and Frank Sinatra on stage. They also have cool props to use like bunny ears for Hefner and pirate gear for Jack Sparrow aka Johnny Depp . :D Bring your camera, and have plenty of memory space!
All in all, MT is fun and well worth the coupon price :) . You can find coupons just about anywhere. My bf managed to snag discounted tickets on groupon .com -regular $25.