Its not genius.
The game play is terrible.
invunerable with 3-4 artifacts 2 hours into the game, easy as pie from there, that and bioshock, this fake fps/RPG genre people are trying to start, they increase stats of the "hero" and everyone else stays mostly the same. Both games are semi challenging for a hour or two then its 4-10 hours or running about with a care in the world almost completely invunerable and no punishment for dying on the rare occasion you would. Also a lack of, well, change, lack of increase in difficulty which is really one of the main staples of FPS play, more and harder bad guys slightly offset but more and better weapons and more ammo for better weapons the further into the game you get. Bio and Stalker completely ignored that part.
Also the best battles in Stalker are the scripted ones , even the first farmhouse but mainly the car junk yard, where they actually track you down and search, spread out, get you in crossfire. The rest of the game you suddenly can shoot from range and most of the unscripted "natural" AI simply had them run to the nearest thing to hide behind and run from one end of it to the other. Complete tosh.
I hate that people seem to link linear gameplay and scripted events, sure you can have both together, many games do, and many games do it brilliantly. At the end of the day AI will never be "fantastic" it might get merely good, while a scripted event can bypass 90% of the bad AI as a real human with a brain that can use real tactics can fight you.
THats essentially what happened in that stalker junkyard fight, you're playing against a human opponent moving his units where he wants in an inteligent way to kill you, which is basically missing in unscripted attacks.
Both games have all the best content in the first hour or two and then complete boredom with that feeling of finishing for the sake of finishing rather than really wanting to. Bioshock especially Big daddies way to early in the game, then they become insanely easy to kill very quickly and nothing bigger and badder comes along to be smacked about.