I think you come across very genuine, not arrogant at all. And it shows that you do your best to reflect, don't worry about that. However, while the philosopher (and sensationalist) in me want to disagree: yes, be more technical! You have a unique audience and guests to cater to, I can't imagine the pressure.
That being said, it's your podcast, and it wouldn't be where it's at if it wasn't for your character and honset curiosity, and its appreciated for exactly what it is. Cheers!
Interesting. I don't see much in the way of arrogance when I watch these. What you call "deadpan delivery and lack of personality" I attribute to his being Russian, and just having a somewhat stereotypically Russian style of delivery.
I have a close friend who is Russian, and I've found that, at least in his case, there definitely is a sense of humor there, despite the stereotypes. I just find his Russian humor to be very subtle and even after all these years I don't always pick up on when he's joking and when he isn't. From watching your interviews, I get a very similar vibe. I suspect you have a fine sense of humor, but that not all Americans will appreciate or recognize it easily.
I don't know how you could possibly listen to his interview with George Hotz (one of my favourites) and say that he has no personality.
I think you have assumed the worst, that his entire personality is an act, and this has coloured your view of everything else. Once you realize that he's being sincere, I think you will find it much more enjoyable.