I'm 3/4ths through the presentation and so far I see no sign of mental degradation, but:
- he seems very focused on garnering favor with the crowd based on his Taiwanese background, to the point of talking to his American helpers in Chinese, showing that his attention is more with pleasing the crowd than communicating with his helpers
- His crysis-joke combined with his lack of interest in actually focusing on bringing things to gaming just drives home the gap between the image he has of himself as a friend of gamers and how he is actually presenting himself
- He has some minor issues with choosing what parts of his thought process he keeps to himself. These mostly seem to center around a dissatisfaction with certain elements of the presentation (like the lack of sound effects and how the audio guy doesn't give feedback to him through his ear piece about the sound levels). He starts acting rather childish, but this can just as easily be a sign of him being spoiled rotten, which he probably is.
But he does consistently keep explaining his vision, without losing his way, repeating himself or otherwise acting like Brandon.
And I don't understand the 'speed' comment, since he talks at normal speeds and his enthusiasm seems to fall within perfectly normal boundaries for an American who tries to sell you his stuff. As a European, I'm used to seeing excessive enthusiasm from Americans even when they are peddling a turd sandwich.