SpongeBob SquarePants (Seasons 4-5, 9-Present)

SpongeBob SquarePants is an American animated television series created by the late for work marine biologist and animator Stephen Hillenburg for Nickelodeon.

Why it's mixed

 * 1) People had mixed receptions on these seasons. Either people think that these seasons are good seasons or bad seasons.

Altogether

 * 1) Both of them has a fair share of good episodes such as "Fear Of A Krabby Patty", "Skill Crane", "Krusty Towers", "Friend Or Foe", "Roller Cowards", "Bulletin Board", "Mimic Madness", "Karens Virus" and more.

Season 9b-Present

 * 1) Awesome Animation that feels like a throwback to cartoons from the 40s and the 90s.
 * 2) It also has a really Great Choice of music.
 * 3) The characters have redeemed themselves from the dark ages (2008-2012)

Altogether

 * 1) Both of them has a fair share of bad episodes such as "All That Glitters", "The Thing", "Fungus Among Us", "SpongeHenge", "Squid Baby", "Little Yellow Book", "SpongeBob You're Fired", "The Fish Bowl", "Sportz?", "Ink Lemonade", "Spongebob's Bad Habit" and more.

Season 4-5, 9a

 * 1) It was the same era (Post-Movie to be exact) where it had a TV movie named "Atlantis SquarePantis" which is not well-received by viewers.
 * 2) While nowhere near as noticeable as Seasons 6-8, the flanderization of the characters was slowly starting to kick in depending of the episode.

Season 9b-Present

 * 1) It has weaker writing compared to the first three seasons and even season four of the show.
 * 2) The voice of the characters can act noisy and scream at their voice records at several times.
 * 3) The animation looks kinda cheap and roughly done in some parts, though still decent.