I have not watched the video because I still want to play the game some day, but I have read this thread (I don't really care about boss spoilers). The world being incoherent and the linearity sounds extremely disappointing, enough to make me wait for a steam sale. The well realized world is the number one reason I liked Dark Souls. Unlike what seems like a large part of the people who played Dark Souls I didn't play it because it was a hard game. For me the combat always felt secondary to exploring an (for the most part) amazingly well designed and dangerous world.
At least now I can prepare myself for a disappointment when I finally play the game.