Oh boy. I was going to make a long list but some of these opinions gave me cancer (not trying to disrespect tho), so I'm going to talk about cartoons and anime since I've been looking into them more recently.
Steven Universe is shit.
Rick and Morty is overrated and is okish, but far from great.
Ok K.O is, no pun intended, just ok.
Rwby is really bad, sorry.
Star Wars TCW is inferior to its 2003 counterpart. And I don't need to explain, I just need to say this: Gendy Tartakovsky
Dragon Ball (And that goes to the classic, Z, Kai, GT etc...) is literally unwatchable to me. The show is so slow paced and so little happens in an episode that it makes me cringe. Dragon Ball Kai is much better in this aspect but is still very hard to stand and watch those long scenes of litterally nothing happening so Toei can milk the shit out of every Manga chapter they can. The Manga doesn't suffer from bad, but by not making me almost sleep it makes me pay more attention on how flawed, inconsistent and cliché the show is. I appreciate the show because it was one of the first Anime I watched, and back then, it was really fun to watch. And about Super, it's really bad, but it's bad because it just brings the problems of the original series and make them either worse or bad in a *different* way.
I didn't find Code Geass to be as good as they say it's, specially the twist. Still going to watch Season 3 when it comes tho.
Shokugeki no Soma is much better than people give it credit. The fan-service isn't as bad as people say, and it helps the show way more than it hurts it (Although I agree that in the current arc of the Mangá, the fan-service is getting way too overused).