Essentially, the more linearity, the more narrative potential and vice reversa.
So what do you want? An engaging story that is well told? Hell, I love that, both in films, books and games. But then more or less all "freedom" in the game will have to be a disguised cattle track.
Somebody opted that the graphics in HL2 were substandard? :-? Excuse me? What games are better then? And atmosphere? If that isn't 90% art/graphics then what is it?