Lugbzurg said:
He screams, swears, and attempts humor by going crazy all the time. No wonder he's popular. I kept hearing people exclaiming how amazing he was supposed to be, and at some point, I stumbled upon his playthrough of Doom 3. I was not impressed (with PewDiePie, that is; I still wanna play Doom 3). Then, a friend of mine showed me his "Happy Wheels" video, which was supposed to be the grand daddy of them all. It was stupid. I'd sooner watch The Annoying Orange than PewDiePie.
So, who do I prefer, instead? The first I got interested in was John Ortiz (Somecallmejohnny). Then, there's also PeanutButterGamer, JonTron, and NintendoCapriSun. I recently took a look at some of Clament's videos, and should probably give a look to these "Chuggaconroy" and "Lukhadjin" (or however her name's spelled) people and see what they're like.
Yeah, I happened across PewDiePie when I was looking around for videos of Slender (too much of a wuss to play it myself)... and I just thought "Really? This guy is popular?"
Then I found Sinuyan's channel and watched that instead. He's got a very mellow kinda vibe that goes surprisingly well with all the horror games he plays.
Honestly, actually seeing PewDiePie's vids, and some of the comments of praise, reminded me of something that happened a few years ago, back when a younger cousin tried to show me "This hilarious Fred guy" on youtube. I just remember thinking "This is supposed to be entertaining" and then feeling very old. lol
As for let's players, I like to follow, hmm... NorthernLion, Necroscope, Sinuyan, MangaMinx (now TheRPGMinx), GettingDaved, GameGrumps (Jon Tron + Ego Raptor, ohyeah

) and a few others here and there. I like a lot of the guys from the Something Awful let's plays too. I don't follow them regularly, but I do poke around the LP Archive every now and then to find new things.
Really, the Something Awful Let's Play Archive should be anyone's first stop for an LP, as it probably has the biggest collection of the most consistently good ones around.