Randy Rhoads
Reception of the album has been generally positive. In particular, the neo-classical guitar work of Randy Rhoads has received much praise. Steve Huey of AllMusic stated that "it's not uncommon to find fans who prefer "Diary" to "Blizzard", since it sets an even more mystical, eerie mood, and since Rhoads' playing is progressing to an even higher level". BBC Music referred to the album as "a classic rock record in every way", "lifted out of the ordinary by the legendary rock axe god, Randy Rhoads". Canadian journalist Martin Popoff called "Diary of a Madman" "a lasting classic that stands as the definitive showcase for Randy Rhoads."