No, the reason why I can ppick up Halo and play likes it's the first time is becasue it's a damn good game. I can't think of another FPS that I can do that with. I just started Attack on the Control center for the upteenth time. Great level.
I know I'm in the minority here, but Half-Life did not do much for me. I didn't like the graphics at the time, and the story was very slow to develop. I'm not sure if I even finished it.