I can think of a few reasons SpongeBob may not seem as funny after the first four seasons. If you watched it when it originally aired, you are presumably 4 years OLDER than you were when the show first started. So you have likely matured a little,... read more
Not only that, but it was different types of humor and styles that help made Sponge Bob the show it was in it's first three seasons. We had meta, satirical, dark, and surreal humor among the obvious types the would appeal to kids. read more
If you want a show that has Spongebob's earlier charm, you should try Flapjack, the writing is almost as good as Spongebob's first 3 seasons and Flapjack himself has the same amount of charm and charisma Spongebob had in his glory days. read more
Patrick's increased stupidity: Patrick's stupidity used to be funny in the first three seasons. Now he is so idiotic, its not even funny anymore and just plain annoying. Nick refuses to cancel a cash cow: Nick just won't let Spongebob go. read more