A lot of YouTuber's have declined in comedic value. Smosh is still funny, but not nearly as much as the old Smosh, and the same goes for Kevjumba. Nigahiga is just terrible nowadays. All though, I think Raywilliamjohnson has been really consistent, and I do laugh at most, if not all of his videos. So, it would have to be him, KassemG, and TheFineBros: Teens React is so funny. But, there's more YouTuber's I'm probably not remembering at the top of head.