First of all unless gamers have a supercomputer at home, they are not going to be "blown away" by the visuals. Now, if they do happen to own a rather powerful machine, the graphics will certainly impress them unlike any other game. If they can get a decent frame rate to enjoy it, that is.
Bottomline: Nice demo but Crytek really has more work to do if they really expect this game to do well. This is one of those instances when releasing a demo that has major performance issues may really hurt the bottom line. They may need to release another demo once they fix the optimization issues.