I totally agree on one level, but in my experience, games with fun demos go on to be fun games, and games with broken demos continue on that path. Gameplay can't be faked like story and acting can be cut around in a movie trailer.
Dyack insinuates that because Too Human got a poor response at e3 a year ago, that everyone is saying the game is terrible. No one's saying the final game will be horrible. But what has been shown wasn't impressive.
If he spent the time he's been using to do interviews about making the game industry like the movie industry (working in post on commercials and films, I can tell you his perception of our industry is rather off) he could drop a newer demo and shut everyone up once and for all.
All this going around and talking about how great the game is now is hypocritical. Isn't his whole point that he shouldn't have to talk about it or show it till it's done?