I liked all of the Stan episodes and thought he was on just enough. His presence represented some extra continuity in a series that was all too lacking in that area (one of the few things in which Golden Girls lacked).
As for the original topic, the first two seasons are my favorite of the show. I think those are the best and most relatable episodes, definitely the least outlandish. All of the seasons have great episodes, but the fourth season was probably my least favorite overall. The last season was decent with a few exceptions.