a) His cartoons are not funny.
b) His cartoons are poorly drawn--static figures, easy to do.
(Side note: I really miss the two best--i.e., best combination of being funny and well drawn--cartoon strips of the past 25 years, namely, The Far Side and Calvin and Hobbes. I wish somebody would talk those two guys out of retirement. At the same time, I know how hard it is to keep a cartoon strip up to the standards one has set. The well can run dry.)
Our local paper, the Memphis Commercial-Appeal has announced a return of The Far Side starting the first of next year.