He's not a comic genius, he's a marketing genius. His comics are actually quite banal; everyone hates their printers, a list of reasons why makes us feel good but isn't actually funny.
I guess everyone's sense of humor is different. Personally, I found the "literally" comic confronting, but I was rolling on the floor laughing at the gay-roller image... IMO, the guy is a comic genius :-)
Of course not everyone would agree with me that it is banal, but I have read a number of them I've seen linked here and there, including the above. I didn't find any of them particularly amusing. Nor did I like the artwork.
That's the least funny one I've seen yet, it's just some information that most people learn in school put to pictures. The kodiak bear pic however, is funny.