The various future episodes always feel like pale imitations of the original, and not just because "Lisa's Wedding" is one of the best episodes of any cartoon ever. But they do have their moments.
The last time I tried watching the show it was painful.
I really think the writers have gotten lazy to the point that they just send family members, neighbors or random strangers on the street in to work for them. "Hey, Uncle Charlie, wanna make fifty bucks?" And they all presume at least one real writer will show up.