Up to and including 'The Jolly Boys' Outing', OFAH is just brilliant, one of the best Britcoms ever. And that covers a good 40 or so episodes.
Unfortunately, I think anyone who has a problem with it may be thinking of what came after: the 90s stuff is often very good, but with definite signs of fatigue, and the 00s trilogy should never have been made (IMO).
So, a number of episodes too far, ad nauseam repeats and (sorry) the not great spin-off 'The Green Green Grass' have all contributed to this "Only Fools isn't as great as it's cracked up to be" philosophy which in my experience is fairly widespread.