Ah...those were the days, when game's were proper games, :p
I played Wolfestein and Doom II, but Quake sort of passed me by for some reason...think it was mostly down to lack of a decent PC more than anything...

What engine are they using now? Is it a new one? Was Quake III a similar engine to 'Return To Castle Wolfenstein' ? 'cos that game rocked...

Santa's a guitar player?...well, you learn something new every day, :p