SpongeBob SquarePants jumped the shark HARD. Prepare yourselfs for a big wall o' text...
The first three seasons of SP were as funny as Rocko's Modern Life, they even shared many of the same staff. After the big movie, the show went through a change of writers and such, causing the show to feel "different". After Season 4, the show started getting worse and worse. Four and five were tolerable, but the ones after...yuck. The show pretty much fit everything that qualifies for Jumping the Shark. The plots started getting more flamboyant, extravangant, and overall large in scale (it's advertised that way, it's usually just a boring episode with nothing but filler), introducing new one-time characters almost every episode. The plots almost never involve just Squidward, SpongeBob, and Patrick (like the older episodes like "Bubblestand", "Squid's Day Off", "My Life As A Teenage Gary", and "Reef Blower"). The worst part is, EVERYONE has been Flanderized. SpongeBob is now a very childish and annoying individual who breathes heavy on the phone when Squidward talks (and also spies on him and copies every detail about his house), not to mention he's even as unintelligent as Patrick. Squidward is now a overly-aggravated and tormented person who has the absolute worst karma and gets arrested for stuff like speeding stopsigns and stealing wallets, he also is too mean to everyone around him. Everyone else has been Flanderized, except Plankton. Plankton is the only funny one in the show now. I actually HOPE this show gets cancelled, it will stop the complaining and make way for more shows to take it's space (it gets WAY to much airtime on Nick).