Imagine your very person, locked up in a cryogenic chamber aboard a gigantic starship en route to a very distant place from home. Imagine yourself, facing dreadful foes who have never seen the face of Earth. Imagine both your mind and body enprisoned within an enormous metallic beast with close-to-nothing to survive. Will you manage it? Or you will let Mankind's demise shrivel from your unstill hands?

Okay that was a dramatic way to put it, but it gives you the idea of how much this game affects me.

We have a very deep plot as well as a good Cyberpunk atmosphere, furthermore there is an endless line of items!

The faults that this game has are various:
-Old (can be renewed with mods)
-You don't want it to end! (remember when you played for the first time DE:HR? Same thing here! You don't want it to end! (Luckily there is the stunning editor explored in detail furtherly)

MULTIPLAYER WARNING!
I noticed that when using two or more Windows XPs (who got them anymore?) there are no so many crashes. However if you do use an XP and a 7 (or just two modern guys) you got problems (this is probably due to some sync issue or just Win 7 can't bear it to have such an old guy like that).

I DO RECOMMEND:
1) GRAPHICS ENHANCEMENT
The graphics can be enhanced through a variety of mods which you can find here:
https://www.systemshock.org/index.php?topic=4447.0
or
http://www.moddb.com/mods/shtup-system-shock-2-texture-upgrade

2) DROMED (or ShockEd)
And there is DromEd, a powerful Editor which will boost gameplay (if you have both patience and time):
https://www.systemshock.org/index.php?board=38.0
Take a seat during free-time, and watch the tutorials which are very helpful.
BE SURE TO INSTALL THE TOOLKIT AT:
https://www.systemshock.org/index.php?topic=5312.0

3) THE ORIGINAL
I would recommend to play the first installment of System Shock in order to get the bigger picture of what SHODAN is, after you finished the second one. Why? Because otherwise it would spoil everything. You are so lucky if you do not know the existence of the first installment or whatever goes on there, for you can enjoy this game far way better.
You can find the remastered version here on Steam and/or wait for the remake that is going to come out in 2022 (hopefully?).

In short:
Every game you play (from FPS to RPGs) has been directly or indirectly been inspired by this true masterpiece. So if you do not have it, well it's like missing Dante's Trilogy in your home library (well not that so, but say something like a must-have).

Okay this looks like a game with inefable emotions attached to it. You can either buy it (suggested) or not (God Bless You).

Thanks for reading.