PewDiePie is awful, he's horribly horribly egotistical (not as as egotistical as any person in the Yogscast thouggh) and ruined a bunch of games for me by overhyping them.
He doesn't even know most of the games he plays, he just makes a let's play on whatever is popular among amateur lpers, takes some ideas from them and screams every 2 seconds to make it funny.