I also have the dvd, which is like a prequel to the game. It shows everything that happened leading up to you arriving. I haven't watched it but I will as soon as I finish the game. I'm on Chapter 10. Great game.. I personally think it could have been better had it not been so linear. But I guess with this genre of game you kinda have to be linear.
Uh, I'll start to play it on Impossible. I've finished it twice, because achievements. Maxed out is pain in the ass. Also need to buy some suits, need some ms.
I finished it, and it's firmly in my Top 5 games of all time. I started playing it again with all my weapons, and it's still fun! I had to put it away for Fallout 3 though.
I have 45/48 achievements. I need to beat it on Impossible, beat it only using the Plasma Cutter, and escape a Lurker's grab attack 10 times (seems like I would have gotten this one already, but oh well).