Here is a sampling of what they had to say:
Lynn Jacobson of Variety: "[Benanti and Lynch] exude a kind of wholesome niceness that comes across as almost bland; they're attractive, but we never see the idiosyncrasies that mark them for each other. It's hard to say from the outside whether this is a problem of casting, direction, or writing… The show gets off to a rambling start, eating up the clock with comic asides such as a man's inebriated wedding toast, and Robbie's grandma Rosie Rita Gardner tunefully recalling the indiscretions of her youth. This is time that would be well spent bonding the audience to Robbie and Julia and their best friends, the characters at the heart of the play… The second half of the show is tighter than the first."
Misha Berson of The Seattle Times: "[The Wedding Singer] has some winning musical segments, likable performers and a stream of '80s quips, gags, fads and foibles. What the musical lacks is some showstopping star power. Also, the pop-culture-heavy script seems designed for those who know the difference between Bon Jovi and Van Halen, Pac-Man and Ferris Bueller. At 2 ½ hours it toils vigorously but sometimes at cross-purposes, trying to mesh a sweetly goofy love story and a cruder comic grab bag.... [The score] kicks off weakly, with a frenetic opener, 'It's Your Wedding Day.' And most of the ballads feel generic. When the music and Rob Ashford's choreography rev up, though, there are real gems."
Tim Apello of Seattle Weekly: "Harvey Fierstein's Edna Turnblad in Hairspray was not as fat as the chances that The Wedding Singer will comparably stomp Broadway when it opens there in April. In place of Harvey and Marissa Jaret Winokur as the big Turnblad girls, we get the wee homunculus Stephen Lynch straining to fill Adam Sandler's checkered shoes as Robbie the Wedding Singer. And as Julia, the waitress of his eventual dreams, we have Laura Benanti, a talented singer and winsome actor in fine voice, and the wrong role... I'm not sure how much to blame director John Rando. He's a smooth mover. But it was easier to forgive the many bad technical screwups that plagued Hairspray's 5th Avenue world premiere than this show's cold, jeweled movement. It's a heartless putdown of '80s heartlessness."