Here are my detailed reasons for hating the fourth season:
1) The season 4 humer is more for little kids, the ones young enough to be watching nick jr, and I'm not just saying that. I've seen my dad (age 50) laughing at LOTS of moments on sb in seaons 1-3. Same goes for my punkish teenaged sister, who says she hates sb beleive it or not. But as for season 4, all the humer is the kinda thing that only young children laughing at. The new writers aren't showing the kind of comedy that children, teens, AND adults can find funny in the new season.
2) That new voice gets on my nerves. I'm sure that goes for lots of other sb fans. I dunno who's idea it was to make sb's voice sound 10 years younger, but if they thought it makes spongebob cute then they're wrong.
3) The plots aren't like the previous ones. When I'm watching tv and an episode from the third or second season comes on, I'm always like "OMG This is my favorite episode! Oh wait. They all are!" But not with fourth season ones. In fact when I ws telling my dad about how the new writers aren't the best I've seen, he agreed that the storyline seemed alot different in the newer episodes. This suprised me because my dad's not really into sb (though he knows i adore it), and for somebody not really involved in it to notice that should mean something.