The negative comments on this thread are the legacy of the two bad movies, the bad national tours, the bad 20th Anniversary revival and countless inept community theatre productions. But that original Broadway production was sharp, smart, tuneful, beautifully designed and performed. I remember seeing it about a year into its run with an audience that went out of its mind with delight. I do suspect that its producer, Mike Nichols, had a little something more to do with that production than credited, as that production hasn't been equaled. If the new production returns the show to a semblance of what was originally written, it may just surprise all of the naysayers around these parts.
Begin at the beginning and go on till you come to the end: then stop.