You need to play the first one!
It's still in my top spot for best game I've played. System Shock 2 was great, especially when compared to most games now, but it was unbalanced compared to the first Shock. It needed more refinement. Things like the super fragile weapons and monster respawn really pulled the game down for me, but I finished it and will play it again.
BioShock.

This game was a massive disappointment for me. If the next Shock continues down this gimped road, I won't even bother. I refer to it as PlayskoolShock. It was more like a Disney ride than a supsesul sci-fi horror novel. It didn't take long for the game to grow repetitive for me. It was more of a FPS than a Shock game.
I could not finish the game and I had really looked forward to it --even considered getting a 360 if the PC version wasn't released(Thankfully it was). For me the incentive was not there to finish the game like the first 2. I ended up watching the ending on YouTube. 
I really miss companies like Looking Glass. Blah. Now I'm depressed.
<]=)
BioShock.
This game was a massive disappointment for me. If the next Shock continues down this gimped road, I won't even bother. I refer to it as PlayskoolShock. It was more like a Disney ride than a supsesul sci-fi horror novel. It didn't take long for the game to grow repetitive for me. It was more of a FPS than a Shock game.
I really miss companies like Looking Glass. Blah. Now I'm depressed.
<]=)