On the first day of radio-TV programming and management class in college, the instructor told us, "We do have a textbook for this class, and it's...adequate."
With a ringing endorsement like that, it was obvious that studying for tests would mean paying more attention to the material the instructor brought up in class instead of what we read in the textbook. It was just as well, considering that the textbook, in 1992, contained such gems as, "Some radio stations are starting to use compact discs for their music library."