Doug is not a specialist animation, and i can barely say that he is a specialist in movies and shows in general.
Doug, like many early 00's youtube guys, is a guy who likes media, and of course he likes it, media is made to be liked, everyone likes media, and anyone call faill in love with it, and this is ok. But to have a actual worthy discussion about them, you need to fail in love with the specific medium itself. Even while still going to movie school, Doug's views on what media is, is still very superficial and entry level.
Doug can't understand what makes good writing. Or good animation. Or good cinematography or even good comedy timing. He can spot obvious flaws and make obvious statements like anyone could, but yet he lack so much understanding in explaining them (since he just "feels" them) that needs to make painfully convoluted explanations in form of autistic sketches, then he sells them as comedy, because they are convoluted but still "self aware"
Doug's comedy, is that he is a bad critic. And he calls himself a critic, because he is not a very good comedian