Pre-rendered game demos at E3

I must admit to being very impressed by the Killzone 2 trailer from E3 (http://www.gametrailers.com/gamepage.php?id=1668). It invoked a similar response to the one I experienced when Bungie released the first Halo trailers - I was seriously impressed and sold on the whole concept. The action, the detail and the effects just blew me away. Once again, I was ready to embrace the concept of FPS on a console. Moreover, the apparent power of the PS3 was impressive.

I own an XBox, but I am not a fan of FPS games on consoles. The screen resolution is too low (I want to see more detail) and I find controllers a very poor substiture for a keyboard and mouse. I think HDTV and the high specs of next-gen consoles should go a long way to remedy some of my concerns.

But is the trailer pre-rendered? Is my enthusiasm misplaced? Is the whole thing too good to be true? Regrettably, it seems likely that it is pre-rendered. (http://ps3.ign.com/articles/616/616591p1.html) :(

This is very disappointing and quite frustrating. I find the whole process of showing off games for hardware that is not even in production antithetical to developing trust in a brand. Release the specs? Sure, go right ahead. But please, please don't use a pre-rendered movie to indicate to me what your game might look like when its finished and the hardware is ready.

Postscript:
I'm not saying that every game for the PS3 shown at E3 2005 was pre-rendered. I have good reason to believe that some games, at least, were running on hardware designed to emulate the specifications/features of the PS3.