Yes. Plenty of times. For instance I just criticized THPS5, a game that has not even come out yet, for having poor character models. Furthermore, I have called Comcast a bunch of Fascists without even having dealt with them before. There is nothing wrong with criticizing something that you have not tried. If the pro-sayers are justified in their criticism of your "unfounded" criticism, then you are the only one who is losing out anyway.