The Simpsons - Yeah, we all know why, what's up for arguing however is when it did.
Futurama - The seasons that came after it was canceled from Fox. It just seems that they're trying way too hard. Also, Fry knowing about things that he should be completely unaware of since he was frozen (at one point he says something about Lady Gaga, but by the time she became a thing/big, he had been frozen for tn years).
The movies are hit and miss from what I understand (think I only saw two of them, so I can't really say).
Prison Break - The first two seasons were really good, but after that... blech.
I kind of want to say Castle, with the whole over the top murder cases they keep getting, the conspiracies, and having to save the city/state/world crap they keep doing. Not to mention it's been implied that Castle's unknown father is some sort of super secret agent that's part of bla, bla, bla, who cares. The first two seasons were great, the third was mostly crap, but the fourth was ok at best. So I'm still holding out hope for it.