PDP's fanbase makes up for alot of his hate and his humor well... not everybody likes it but the people who do are usually pretty young so yknow, anything will give em a giggle. Also his random screaming is quite annoying for me, but I don't think the guy is bad or anything it's his job and he probably has to pander to his audience to stay in business.
Im not sure about Markipler, he seems to have been popular with some Tumblr users and the fnaf fanbase. Also if anything his voice is another factor for why he may be getting popular (which I gotta admit its p nice) Once again I don't like his content but I don't think he's a bad guy. I heard people calling him the "american pewdiepie" a few times but strangely I bet if i did watch his stuff I wouldn't mind it as much.
Cry I'd say isn't that popular in terms of youtube, when you think about it 1mil subs (slowly approaching 2mil) isn't that large when compared to other, larger channels. I like him for quite a few reasons like ditching the facecam stuff, and how he rips on his fanbase if they go nuts (just lookup the crybabies story) sorta like the anti-LPer in a weird way imo.