I'm going to go meta for a moment here: There's a very common trend and an argument against people who think bad artists, of any kind, should not be successful: if you don't like it, don't participate.
The problem with this is that my dislike of a fair bit of abstract art, some music, some games, and definitely most Youtubers of this kind is that it isn't fair to people who are actually informative/inspired/innovative/visionary/skilled or whatnot. It IS legitimate to dislike the fact that something is successful even if you can isolate yourself from it, because it takes the place of good content that could be being made.
Back to this topic, I followed a link to one of this guy's videos once. I saw the likes and thought "Well damn this guy must be really good". This is mindless crap, is not amusing to me, SHOULD not be amusing to anyone else, and relies almost solely on the main joke of gratuitous use of the word rape. There are better (OBJECTIVELY better) let's players who are not being watched because their potential watchers are being made stupid by this person.
I don't watch a LOT of let's plays, but I watched Northernlion's Binding of Isaac videos for a while, and he is constantly explaining why he does things and how mechanics work. Sure, he's amusing as well, but he does a good job of also delivering useful information, even in the later runs when he doesn't have to figure anything out anymore. And there are better LPers than him as well, I've seen them and they exist.
I know right, "why do you get to decide what is and isn't good content". I got nothing, I just think my judgment is decent in this area, and arrive at the same conclusions based on information transferred.
I'm rambling. tl;dr: LPs are meant to be informative and/or entertaining and this is neither for me and inferior to other LPs in both aspects.