It's kinda like the image said. The videos became too focused on arcs, introducing new characters to potentially just throw away, and Mario was just all over the place. It also lost alot of what, in my opinion, make the older ones so good, memes. Sure some are still meme based, but something about them just doesn't land. Maybe it's how short lived the memes they're based on are. I haven't looked at the channel in quite a while, so I dunno what it's like these days.

focusing to much on ORIGINAL SHIT CHARACTERS and doing arcs.