To be fair, the season(s?) that Al Jean is executive-producing the show HAVE been getting better, even if ever-so slightly. The situations and plots aren't so outlandish, and we've been laughing at the same thing and gags for years now-if they kept going into new directions, fans'll complain, if they keep the same, fans'll complain. I think even if the newer seasons suck, they're still trying.
That said, anyone notice onetime 'sucky' eppys in say, season eight or nine once considered out-of-this-world are now classics compared to the newest seasons?