Okay here is why he's full of it and also why Alan Wake will suck.
You may or may not have read yesterday my feelings about the necessity of a delicate balance between business and art in games. The reality is that video games are a product. The product has to be made with the consumer in mind (said another way you and I need to be able to enjoy it and want to spend our hard earned cash on it). If you have a game that has already enjoyed more than a 5 year development cycle and become disappointed when the first ten minutes gets leaked, there are two conclusions you can come to.
Conclusion one would be is that you know your game is terrible and want to build marketing hype that is strong enough to cajole people into buying your game before they see said first ten minutes of gameplay and realized that the game sucks after having forked over $60 hard earned dollars.
Conclusion two would be that you are such an artistic snob you have convinced yourself that, taken out of context, consumers wouldn't understand said ten minutes of gameplay and that to truly appreciate your brilliant work of art you need to complete experience. I can't think of a single game I've enjoyed where watching the first ten minutes before having played it would turn me off to or ruin the experience of playing it upon release.
Either way, the game was announced five years ago at E3 and has been pushed back time and time again. That makes me think of Too Human, or Duke Nukem Forever, or any other number of games that got pushed out and pushed out and ended up either being canceled or just plain ol' fashioned being crap. Granted there are a few exceptions to the rule, but more often then not the historical perspective is apt.
So in short, there is no possible way Alan Wake can be good.