["The Last Sweet Days of Isaac"] isn't very entertaining….
It did not seem an ideal wedding of book and music—perhaps, I think, because the book was so dull….
If there had been less to say on the stage and more music from the background, the show perhaps would have been what it calls itself, "a 1970 musical." As it is, I found it pretty unexciting, like a nothing year.
James Davis, "'The Last Sweet Days' No Sweetheart of Show," in Daily News (© 1970, New York News Inc.; reprinted by permission), January 27, 1970 (and reprinted in New York Theatre Critics' Reviews, Vol. XXXI, No. 11, April 27, 1970, p. 292).