Prey is unfortunately a mirage although the expectation I had on it. It lacks of atmosphere and a good storyline.
There is no challenge in this game, enemies are very easy to defeat , the IA is weak they usually stand in front you so it is simple even to point your foes.
There's no variety of enemies or weapons, basically they attack you in groups of 2 just like Doom 3 but in this case there is no creepy atmosphere, you can anticipate when they are going to appear.
Sound is nothing surprising, dialogues are limited to certain phrases. Sound effects are well conceived for this title and they are a pro.
In terms of gameplay, the addiction of portals and "magnetic paths" does not influence very much, in fact we've seen transport portals in many science fiction games. The paths are a way to camouflage the maps and make them look bigger or complex but you will notice they are still quite straightforward.
Multiplayer consists on classic deathmatch quake 3 style with better graphics. Usually you get bored of it in less than 1 hr.
All in all, if you have played the demo you have seen it all. Prey is not worth it. If you are planning to get a game, there are better titles that offer more value .