bought this game after reading several reviews on how terrific it was: graphically, a twist in gameplay tactics, etc, etc. One thing I learnt, or should have reminded myself of is...don't believe the hype.
GRAPHICS: Exceptionally crisp and detailed is the first thing you'll notice. The brown, organic walls give the game a "living" feeling to the surroundings. Surprisingly modest demands on a fairly decent rig at max settings. By the end, however, those brown walls are going to become so monotonous you'll be wanting to tear holes in them (which you can through portals...more later). Becomes very mundane, at the least and you very soon realize that this is just another space dungeon crawler (ala "Doom3" and "Quake4"). The creatures are not that terrorriffic, and the violence seen against other kidnapped humans is, to my mind often gratuitous and quite sadistic. I'm no "bleeding hearted liberal" where violence in games is concerned, but I think they've just gone that bit too far (any more info would be a spoiler).
GAMEPLAY: You can walk on walls or upside down...that's one twist. By the end, though you'll see it as a gimmick which it is. The use of Portals to traverse time and space is nothing new but well implemented. As is the ability of the main character "Tommy" to leave his physical self as a spirit to pass through blocked spaces, open doorways and portals, return to form and move ahead. At least there's no "Red Key Required". Choice of weapons is quite limited and nothing really stands out. The puzzles are quite simple to solve once you get the hang of the game, so you're looking at around ten hours of gameplay.
MULTIPLAY: Nothing new...standard fair, except for the gravity walk. Not a lot of fanbase support online, though.
BOTTOM LINE: If you've played D3 and Q4 to death and can't get enough, then this is a game for your collection. Don't expect the ferocity of either of those titles though. More often than not you have to shoot at a creature to get it to attack you. Brown walls, gravity walks, portals, spirit -shifting and dungeon crawling. That's it. It's very cheap to buy now (never a good sign) so give it a go if you want. If you have a hankering to explore the "portals" more, then buying "The Orange Box" and having the FPS/Puzzle game "Portal" included is a much more attractive prospect. Too many newer games have surpassed the "dungeon Space" FPS (not all though...*cough*"Hellgate London"*cough*)that I advise saving for "The Witcher" or if you can run it, "Crysis".