It is hard to watch whenever you move the camera. As if the auto focus can't keep up, everything gets blurry.
That is how cameras on automatic mode work in indoors light environments. I've been through this discussion before and don't wish to repeat it again.
If it's just motion blur during pans people are complaining about, then that's a non-issue.
Certainly your decision if you don't care. I stopped watching at around 10 minutes into the video. Starting from 8:20 you were moving the camera around like crazy, waving it over the machine, so it could hardly focus at all. After almost two minutes of on and off blur I decided I had enough.
That is interesting, I have the completely opposite opinion, I guess we all have different opinions how video should be shot. For me, videos where the shutter time is short feel jerky and stuttery (like a fast slide show), whereas motion-blur makes movements more fluent and smooth (fools the eye to think that there is real motion). I assumed this was the reason modern computer games have special shaders to mimic motion-blur as seen in a camera.
But in the end I think we are much to picky, the only reason we normally do not notice these problems on TV or in movies, is because Hollywood and TV use cuts with several cameras instead of panning just because panning always looks like crap. But this is of course something that is out of the question for an interview on the move like this, especially if you do not have a camera crew. (Dave's normal videos have fixed camera in his lab, hence the lack of blur or stutter)
Another big benefit of using long shutter time is the reduced noise since the sensor gets much more light.
In my opinion, Dave's videos are definitely in the top 10% of all video bloggers on YouTube quality wise.