PewDiePie currently isn't playing anything i'm interested in, i've seen some of his Amnesia videos and his videos of him talking to Cleverbot and that other chat bot though, i watched his LP of To The Moon (it was beautiful, PewDie seemingly had to remove his facecam at the end because he may have been shedding manly tears)
Tobuscus' i admit can be pretty stupid, but it's the kind of stupid that i find funny, his Happy Wheels videos are amusing, his Minecraft videos are a bit tiresome as he seems to be running out of things to do in his world so he's just getting mods and such which are amusing for a bit, due to the lack of words flowing into my mind, i'm just gonna say that his vlogs are more informative than silly
As for Nova, like PewDiePie, i haven't been subscribed to him as long as i have Tobuscus because i didn't bother to do so until they started appearing in my recommendations, Nova's actually more amusing despite how he can be loud sometimes, his Garry's Mod videos are amusing because even though he has no idea what he's doing, he's slowly learning thanks to his friend and his subscribers, his Just Cause 2 Multiplayer videos are also amusing because of the things that go on in that game and it's chat as well as the things he and his friends do, like attaching a boat or a van to a jet and flying through the Mile High Club with it attached just to freak out the inhabitants, he sometimes plays Happy Wheels but it's not often, which i'm okay with
Overall likage in this order: Tobuscus, Nova, PewDiePie
I watch Chuggaaconroy and Raocow too, but i don't feel like going into detail anymore but i'll say that they're more interesting and fun to watch than all three, IMO