I agree with you completely, Saam. I'm still absolutely in love with System Shock, and keep playing through it at least once or twice every year. I don't believe that any game will ever replace it as my all time favourite. I don't care if the graphics are outdated, because after a few minutes I don't really pay attention to them anymore, I just feel completely immersed. The music is still some of the best music ever made for a computer game (the Executive and Security levels' music are probably my all time favourites). I may know where most of the enemies are, but I still jump in my chair everytime I listen to some robot gearing up to attack. I still fear every single second spent in Maintenance or Beta Grove. And I still feel a great sense of accomplishment every time I see the 'It's over...' screen.
So I join in your 'thank you' to Looking Glass for such a wonderful game. And I add a 'thank you' to yourself, because we can say that TTLG is, in good part, the result of your love for System Shock