Honestly, I still think some of these look reasonably close to the final game, at least in terms of the art assets or look like they could have plausibly represented where the game was at the time those trailers were made. In the case of some of them, the game wound up going through another year-plus of development afterwards, and things changed mid-development. Stuff like this is why I'm in favor of devs just not showing anything off at all until the game is basically done, or at least in post-production or something.
This one probably hurts the most.
To be fair, didn't Sony changing the PS3's GPU later on sort of pull the rug out from under Kojima?