I think he's a pretty likable guy and I dig his show. It's certainly funnier than Ferguson, Letterman, and often Conan. (Fuck Leno.) He's an underrated impressionist for sure.
I feel as though if it was ten years ago, I would be as in to Fallon as I was in to Conan, since I was a college student that stayed up all night and drank a lot of beer and did a lot of drugs.