I agree with anon, though. Tom and Star being together added nothing. They could have broken up in season 3's finale and used the time they had to improve the final arc's story.
But no. Season 4 spent like 100 episodes on Tom and Star being awkward and wasting time until the inevitable break up happens, while the rest of the story is a rushed and barely-coherent mess. If I can say one good thing about it, it's that it was more relevant to the characters than Marco/Kelly's "arc."