Does Cushman actually say this? I know he reprints the list from Broadcasting Magazine, but that is only based upon the ratings for the second and third episodes broadcast, not a reflection of the program's performance over the course of the season. (The list is also, at least in the first edition, inaccurately reproduced). The archival sources I've found have placed Star Trek around 50th place in the 1966-67 season. It certainly doesn't show up in any top (20, 30, or 40) series lists in Broadcasting Magazine after the first few episodes. The ratings weren't disappointing, per say, at least in the first season -- but the show definitely wasn't a "hit" in any meaningful sense of the term.