Hey punk! I don't know what "USPs" means, but I'll just pretend I do and argue against you anyway. Granted it used a modified version of the Quake engine, but that was still pretty sexy back in '98. It certainly wasn't ugly. Don't you remember the animated faces of the characters, the huge tentacle-monster, the intricate machinery on show in the cavernous, erm, caverns, in the intro? The beautifully animated monsters, the turbulant (yes I can't spell) water in Team Fortress, all that mad alien stuff on Xen? It may not have been "groundbreakingly gorgeous" but it had a certain graphical awesomeness that other games of the time hadn't yet achieved. Maybe you didn't have a 3dfx card. I did. I was special.