I think for the same reason people like watching "making of" documentaries or seeing the work processes of famous artists / musicians etc.

Either that or we are just voyeuristic.

Plus this is live, I can't think of anywhere else you can watch somebody actually work on a serious commercial game in realtime.

I don't think it's the same. This is the (tedious) process of composing something. Ever watched a video of a composer composing Or a painter paint? Must be distracting for him too. Either that or the attention actually forces him to be more disciplined.

A lot of other people think he has done great things. Opinions can and do differ.