I mean really, he's so cheesy and fake and just plain dumb. It's like within 1 and a half years, he suddenly exploded into this massive bubble. He always acts like he's so special and better than everyone else, he always is "reserved". I really dislike that. He puts barely any effort into his videos, his jokes are overused and unfunny. Everything seems to be staged.
It looks like game commentaries are the new big thing.
(FYI: A new similar channel to Pewdie that has gotten much popularity called GameGrumps has gotten much attention and could very well top Poodiepie)