stalker isn't that good imo. i have like 50 hours in it and beat it twice and its really lacking when compared to a game like fallout 3 or new vegas, or even metro 2033. its a finished game but it really isn't polished, which is understandable for a 2007 game, but still... theres like no rpg elements at all in the game, you spend so much time just slowly dragging around corpses full of items, the damage system is awful, the ai gets stuck frequently and feel like zombies not actual NPCs, the enemies are all super 1 dimensional and lack any kind of distinguishing abilities (except for the mutants)
the game earns points on atmosphere and graphics alone. everything else is mediocre. if they change their systems and adopt better mechanics it has the potential to be a great game