How impressive? He is impressive and just talking about what he does and loves is easy :)!

it was more impressive last year, when he was talking for 3.5 hours while the most of the group stage games of quakelive tournament was played. there was only one quakecon stream allowed, so those games had to be democasted later.

i had a very mixed feelings: on one hand, listening carmack is very interesting, on another - i am a quake fan and wanted to see great games.

this year they have a separate stream for games, and it is great btw. absolutely top notch work from the faceit team: http://www.twitch.tv/quakecon