I would say Stalker would actually make a pretty decent movie. There's the amnesia that's so loved by film makers, the post apocalyptic setting, the advancing story, the varied characters and the interesting set pieces. Really the story has very few main objectives, and few characters so it would be easy to include all the important parts into a movie. It feels rather cinematic as a videogame, it would probably work well in movie format. The guy gets thrown from the truck, rescued, talks to the merchant and sets off trying to find Strelok. Help the Stalkers in the car park, move towards the bar, X18, Yantar, X16, the Brain Scorcher, into Pripyat and on to the Sarcophagus. There's enough NPC's and enough story and important set pieces to make a decent movie. Especially if they actually filmed it in the exclusion zone. The only problem, which I know would arise, would the filmmakers would want to include copious amounts of dialogue, necessitating a companion, and they would have to throw in a love interest. Honestly, I think people can tolerate watching a movie where there's no dialogue for five or ten minutes, people don't have to constantly be talking. "Oh shit, there's an anomaly up ahead!" "Well, all you have to do is throw a bolt in it to see exactly where it is!" "Oh, I didn't think of that, thanks generic sidekick #112!"