I don't think the actual record is the problem, as in the Win, Lose, Draw column more the fact we're not even putting up a fight anymore. Every year we've usually took one hammering from one side of the Old Firm or both, but we also was able to look back at a game and think "if only this happened, or that went in etc." We can't even do that now.
Look at United today, played the game with 10 men for an hour - lost 1-0. What we've done in the past against Rangers, would have seen double figures probably.
Saying that, I don't care if we lose all 8 games against the Old Firm, if we win (with some draws) 95% of the rest of our games!