Here is a sampling of what they had to say:
Steven Oxman of Variety: "The Drowsy Chaperone, an homage to the melodic, slapsticky musicals of the 1920s, emits enough intoxicating charm for just about anyone to get drunk on... This delectable show operates on two planes, as a guided tour of a make-believe musical from the era of pure escapist entertainment--when the gowns were always gorgeous and the plots paper-thin--and as a surprisingly heartfelt tribute to all who find solace in a favorite show when life's troubles are taking their toll. Retro yet original, genuinely funny, performed with near-perfect precision by a grand ensemble, this is a show lover's show, and plenty of its patrons should find it positively inebriating. This is an elaborate show, and first-time director Casey Nicholaw who choreographed Monty Python's Spamalot manages to keep it all crystal clear and humming along. He's helped enormously by David Gallo's ever-inventive set design... The Drowsy Chaperone is a more satisfying show than [Thoroughly Modern] Millie, equally mood-lifting but less problematic. There are, as always, limitations. The one of most concern is the score, from Lisa Lambert and Greg Morrison. Not that it's bad; it's actually very good. It just never quite soars... There are great numbers--the tap-dancing 'Cold Feets,' Foster's showstopper 'Show Off,' Drowsy's anthem 'As We Stumble Along.' But this is the one element that could use a touch less self-consciousness. We're never quite given the chance to get lost in a song, in part because we're watching the narrator get lost in it, or we're pulled out of any musical reverie with another good gag. But the gags work really well. And the cast is eminently game, each performance topping the next."