It's not a real successor to System Shock 2 but if you enjoyed SS2, you'll
love Bioshock.
Right when I started the game suprised me. Once they set you in the water after the crash, I thought it was still a cutscene... heh til I moved the stick.

oh wait..
The game is a technical masterpiece and I'm so glad it's a focused single player FPS still.
The Unreal engine rules.