Again you have to becareful with such videos showing you comparisons, they quite frequently misleading, whether by the people who put them up on youtube or by the technical aspect. Aften the video on youtube are pretty poor quality to even make a fair comparison since even 1080p PC videos or not the quality of the ingame fidelity and the XBox unscaled looks a lot worse.
Also, if you take Crysis on the console for example, they used the Cryengine 3, which used deferred lighting. This wasn't around when Crysis on the PC was made, so it's a totally apples, oranges comparison. The Witcher 2 on the PC is actually use old graphics technology and even missing out on some graphics that other DX9 games have, not to mention DX10/11.