I don't consider him overrated, he puts a load of effort into each video he makes on his official channel.
Yeah, he may have cheated on speedrunning but that doesn't ruin the success he's had on the platform, and probably the only reason why this entire cheating allegation has become a big deal is because of his size. It was rigged in his favor, not scripted he didn't cheat to get a faster time, he cheated to get a time faster. Plus you say "speedruns" implying he's cheated everyone single one, which is not true only certain 1.16 speedruns in which he streamed. Only those speedruns are on the table.
His humor? I have never seen a video where he tried the "Hey Sh-- A-- " meme, any person who has a Dream skin is only parodying Dream and instead is trying to make this fictional character Sh--A-- look like a Minecraft god. It would have made more sense if his humor was something like "GeOrGe!" because he screams it so many times during Manhunt.
Don't get me wrong there's plenty to dislike, I dislike how he keeps saying "this is the last manhunt!" when we all know he's gonna do another one soon. I also hated how he has acted on Twitter for the October Mob Vote and when he was first accused of cheating. Everything else I dislike about the involves Dream are mainly things that are out of his control with his fanbase, which makes me angry when people blame him for crud he didn't.
There's plenty to dislike, but many of the things you've said are just flawed or misleading, could just be that it was 1 am for you and you didn't think the clearest about it, but I could also be wrong with that.