I remember the original duke nukem. never really liked FPS's though... (that is, after the excitement of the original Doom wore off. wasted a few months on that).
He's referring to the cult following that Duke Nukem Forever (DNF) has gathered in the gaming community. There are a few games that seem to turn in to vaporware after they are announced. Frequently the fans are kept hanging ("Oh it's just a delay, it'll be out next year", "no the project hasn't been cancelled") so they get whipped up into a frenzy by a couple preliminary screenshots or graphics boards, only to be forced to wait years for a game that may never emerge. I think DNF is supposed to be one of the worst offenders in this account.