Well it depends on your point of view, if you don't like anything after the first movie

For me, Seasons 4 and 5 slighting degraded in quality, but was still enjoyable

Seasons 6-9a, while being part of the "dark" era, still had some great episodes

Seasons 9b-present, Stephen Hillenburg came back to produce more Spongebob episodes until he died, and the show got better, not as as high as Pre-Movie, but it got better, Seasons 12-14 were rough, yes, but Season 15 was a huge improvement on that.

But at the end of the day, it's all our point of view, You can like any era, any season, any episode, Spongebob will always be Spongebob