I just watched that episode, and it was just depressing. The jokes were completely predictable (the frogs in particular were cringe worthy) and the culture criticism sounds like a bad rehash of a George Carlin sketch - and he's been dead for a decade.

By the way, I only started watching the Simpsons regularly when they were on season 15, when Fox opened up a channel in my country, so I saw the old and the new episodes at the same age. I still saw a tremendous difference, and would in fact often change the channel during the new ones.