I didn't see much of The Bob Newhart Show when it was originally on television, so almost all of this series was new to me.  During the first season, I was only getting a rare chuckle, if that, out of the episodes, and I was wondering if I had made a mistake in purchasing the complete series.  Fortunately, seasons 2-5 were better, and I was getting chuckles and sometimes laughing out loud at the episodes.  The introduction of the character known as "The Peeper" was, for me, a misstep, because he was too over-the-top silly to be amusing.  Season 6 was a letdown, with more slapstick (e.g. Zorro) and fewer good jokes.