I knew that there was some site called "That Guy With The Glasses" before this, but hadn't really checked out anything on it until recently when I found an individual known as "Todd In The Shadows" through TV Tropes. The description of what he does, under "Better Than It Sounds", is as follows:
"A dude on YouTube That Guy With The Glasses sits in shadow wearing a hoodie and complaining about horrible pop songs. And it's awesome."
So here is his review of Usher's "OMG", which I agree is pretty subpar for Usher:
http://thatguywiththeglasses.com/videolinks/teamt/tis/tpsr/26951-omg After you're done with that, and hopefully enjoyed it, I will provide you with evidence that even somebody with STANDARDS, such as Todd, has got guilty pleasures. Because to prove he wasn't a total hater back when he was on YouTube, after he'd posted a list of the very worst ten hit pop songs of 2009, he posted a list of the very best eleven hit pop songs of 2009. ("And you're going to hate all of it!" says the caption.)
Click to view
Click to view
ETA: I originally thought of putting his review of "Eenie Meenie" by Justin Bieber and Sean Kingston--which is a song I very much want to GO THE FUCK AWAY FOREVER--in here, because it deserves to be eviscerated and he does it in a way that made me laugh hard enough to almost hurt myself. The problem is that after watching the video--which naturally has clips of the song throughout--I had the awful thing stuck in my head for hours afterward despite myself, and I was thusly miserable. So watch
that one if you're comfortable with the risk.