Damn for once I actually agree with you on this one,there a few games that just have kick ass stories,and long and very interesting ones at that.

but I must admit,I am impressed you put KOTOR in there,you know that is SW related,but Mass Effect is just totally awesome,and as far as other games with an impressive story,well I can think of some older PC games,like these:

Ultima VII The Balck Gate w\ Serpent Isle addon
Ultima VIII Pagan
Ultima IX Ascension
Ultima Underworld The Stygian Abyss
Ultima Underworld Labyrinth of Worlds
and last but not least Diablo & Diablo II and I am pretty sure Diablo III

all these games gave me hours and hours of PURE fun!