I guess it's just Club Penguin, Star Wars, The Owl House, maybe Marvel, and... is that it? I mean by ruin, it'd be executive interference so you can't say that Disney is "ruining" bad projects, it's just that the creative team at Disney isn't really producing quality material. And even then, there are some great 2020's Disney project. Encanto, Soul, Luca, Hoppers, Thunderbolts, Fantastic 4, Loki, Moon Knight, Daredevil, The Bad Batch, Andor, The Mandalorian season 1 and 2, I just mentioned The Owl House, Amphibia, Percy Jackson (arguably), and a whole lot more probably.