In all honesty, the show hasn't been very great for the past five years. Usually the shows start with a good premise but wind up like Saturday Night Live sketches: in too deep and no ending in sight. Honestly -- virtually every episode last season was like that. I've been watching the show since it came out (yes, since I was FOUR) so don't say I'm some kind of "noob" to the show. I've seen it's ups and downs, but its the writers' faults. The voice acting remains to be excellent and the animation is better than it ever has been. Again, there are good premises, but the shows just lack substance. Like Saturday Night Live, there have been rather...uh...dead seasons. The show is probably just in a slump right now, but I'm hoping this season won't be a bunch of nonsensical plots involving Homer getting crazy jobs. It was much funnier when he ACTUALLY had a job and wasn't off being a whatever.
The other thing I don't like about some more recent Simpsons is when they introduce MAJOR series plot changes. They had way too many of those last season and I'm utterly sick of them. Rarely do they ever open up interesting new plots and they take away a TON of the speculation that makes the show funny. You know what I'm talking about.
Now Family Guy or American Dad or any of those "adult toons"...ugh. I don't understand why so many people like that stuff. Things can be funny without having to reduce themselves to the lowest common denominator. Give me King of the Hill any day -- at least that show has a message to it. Too bad they're cancelling it. Just goes to show you--all networks want on tv anymore is mindless garbage.