My wife and I have also seen Chris Hardwick live, if you like the Nerdist his standup is worth the price of admission.
I agree that some of the celebrities just can't get out of "promo mode", but those that do really come out great. I've enjoyed Mark Hamill's appearances, Max Brooks, Daniel Radcliffe, Patrick Stewart and Bruce Campbell. Even his self-deprecating interview of Harrison Ford wasn't nearly as terrible as Hardwick made it out to be. Ford isn't an easy interview, and it wasn't the best Nerdist ever, but I also didn't feel an hour of my life had been wasted or anything.
In addition, for the grand total of $0 I shelled out for the podcast, it's pretty darn good entertainment. I have no need for stamps dot com or squarespace so I don't mind a few seconds of my time being taken away for what generally turns out to be a pretty consistently good hour during my commute.