Most people hate this show because it's a trend to say it sucks. Totally untrue. Its comedy is on par with later Family Guy episodes. No it isn't to die for funny but it will make you genuinely laugh hard plenty of times.
The show failed because too many characters were complete disasters. Tim, Lester, and Holt are God awful. Tim's whole gimmick is sounding like a muppet and being a bear, Lesters whole gimmick is being a moronic redneck, and Holt's whole gimmick is being an unfunny dwarf. Cleveland and Junior are on par with Peter as far as their comedic value. They tone it way down in the Family Guy episodes and I wish I knew why. Cleveland is incredibly relatable and he and Donna are a perfect comedy duo. (WAY better than Peter and Lois as a couple but not funnier than Peter)
Rallo and Roberta are just alright. They're not actually terrible as side characters. Meg and Chris are not funny. I don't care who disagrees. An episode of Family Guy will never focus on them because they are not interesting enough to be more than side characters. We're pretty much getting the same thing with Rallo and Roberta. Junior however is pretty funny.
I wish this show wasn't cancelled but changed instead. Like if they got rid of Cleveland's friends and replaced them with funnier characters it would work.
