I heard somewhere that Spongebob sucked after the movie, so I ask you all this?

When did Spongebob start to go stale, and exactly what caused it, if at all?

I want you all to state your opinions in the comments below. I'd like to see everypony's thoughts on the "golden age" of Spongebob, if there were any bad Spongebob episodes before the movie, and if Spongebob can get any better. Or you could talk about how Spongebob is slowly getting better or even that there's nothing to improve because Spongebob was never terrible at all.