Never. Doonsbury was always like my first college roommate: slept late, missed classes, never bathed, slept in old newspapers instead of linen (I am not making this up), treated women dreadfully, and thought he was the fint of all wisdom while sounding to others like Donald Duck. I moved after the first semester.
On the comedy scale, Doonesbury is in the same class with Mark Trail, Judge Parker, and Henry.