I think his BBQ Bible and BBQ USA books were pretty decent as far as recipe cookbooks go. I liked the country by country theme and state by state theme. He got his name out there before bbq started enjoying the renaissance it is today and is cashing in quite nicely.
His show is, for lack of a better term, awkward. It's not really that entertaining. He clearly was not meant to be a tv host. I think his producers realize that and said "fark it," it will even make people watch it more just to watch the weirdness that it is. Those photo grey glasses, the hair that never changes, his strange delivery. Heck, they even cut to scenes with the crew to fill time. The dude's basically a super nerd.
That said, I do like that he cooks weird things sometimes, the dude's got 5 James Beard awards (4 of which are basically for focusing on eating healthy, which I dig), and you probably won't see him on one of those god awful "bastard chef" shows or contests or whatever (seriously, when is that fad going to end?).
Also, I can't remember a PBS cooking show with more product placement. Oh my gawd. It's grill pron and "don't forget to used your Raichlen endorsed gloves, and tongs, and grill brush, and wood chips, and basting brush, and fire starter, and on and on. When the credits roll it's like a who's who of bbq product endorsements.
I don't turn the channel to watch it, but if it comes on pbs (which is mostly what I watch, the create channel (food, wood working, home improvement, etc)) in the background I probably hit mute and just check out the cookers. He'll be cooking yak or something and for dessert it's a smoked gawd awful sounding random thing. I like to smoke a lot of things...but dessert is usually not one of them.