I know less than nothing about Nick...but I think his schtick works and makes him stand out from the crowd...he doesn't take himself too seriously, and provides some useful information mixed in with the entertainment.
He's up front about why he likes what he likes and doesn't what he doesn't. And it sounds like he is a charitable person. What's not to like?
There's plenty of ex-special forces guys out there if that's your thing.
I usually know why I like a knife or I don't...but it's always good to get some of the gaps filled in by someone who's spent some time with it beforehand.