A couple of reasons. I'm still a sucker for a Great Match and Hunter has had quite a few of them. He's not "on" as often as I'd like, but when he's on he's on.
Also I haven't watched enough new wrestling (new to me, not recent) to have 100 guys that I've watched enough of and rate to honestly place above him. Same goes for other heavily flawed guys with lots of great matches that in a perfect world I'd be able to eliminate, Edge and Angle being the obvious ones.
I am basically excluding Japan so I can't fault you for that. It just means you have something to work towards for the next one. I think there won't be a guy on my 100 that I feel really doesn't belong there, even with my blindspots. We'll see though.