I used to think Bioshock was so damn cool and original, but then I just recently played System Shock 2, and realized that Bioshock is essentially an HD steampunk (or dieselpunk or whatever it is) texture mod for System Shock 2. If Irrational's point was to try and bring System Shock 2 to modern audiences with a different game so people wouldn't think "OH A HURRRRR THUEEYRE A-JUST RE-RUHLEESIN ITS FERR NEHSTALGIA AN IHTZ NAWT GHUD CUZ IT DON'T HAVES GHUD GRAAPHICS", then they succeeded to an excellent degree. And yet, Bioshock is consistently praised for it's originality. Even the plot went along the same lines: Get goal, get sidetracked, get sidetracked again, get sidetracked again, fix all of those, complete initial goal, get betrayed in big plot twist, defeat antagonist, free candy. I actually think Bioshock is fun, but fun in a sort of "I... AM... A GOD!!!" way, because you can essentially be perfect at EVERYTHING. Unlike System Shock 2, where anything you're untrained in, you're pretty much as effective in it as a quadruple amputee sloth in a wheelchair.
The argument most often used against this stuff is "That's just because you're biased because of nostalgia", but such is not the case. I hadn't even heard of System Shock until a year or two ago, and only within the past week have I finished it. While it's a little rough aesthetically, the gameplay is fun and sharp and the story is intriguing. Actually, the bad graphics make it slightly scarier (before you get better upgrades and start encountering less disturbing but more powerful enemies), because you can never get a good look at the hybrids. Their faces are already supposed to be ugly and deformed, and because of the weird 90's 3D, they look even more disturbing.
/rant