When i was a little brat, my Grandfather would watch The Odd Couple a lot of times when we went to visit him. I never cared for the show.
When I was in junior high, I saw the movie with Walter Matthau and Jack Lemmon. I was hooked. I own the DVD and still watch it today, and consider the series an abomination of its counterpart's cinematic legacy.
Neil Simon was one of the three main writers on all 114 episodes, and I never understood how each one could suck so badly. Then again, I never liked Tony Randall, which probably had a lot to do with it.