There's a danger of this thread degenerating into people listing the sitcoms they happen to like. The idea was to suggest sitcoms they not only like, but they think everybody likes, as a universal classic. Just a reminder. Otherwise obscure personal favourites will appear on the list, which isn't the point really. That's a whole different list.
Meanwhile. I'm only crossing sitcoms off the love/hate list if you have strong feelings about them. Saying "well it's OK" is not enough. That's my rules.