Well, it is an old-fashioned, brainless FPS (with driving) in disguise

Finally got around to playing it last month. Not bad, but it felt like Borderlands without the "RPG elements" (character building & random loot).
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Also, alot of these games are just "published by Bethesda", not actually designed or made by. RAGE is iD, Dishonored is Arkane, etc.
If they had the rights to/published Stalker, that doesn't mean that the Beth Game Studios / Fallout people would have anything to do with it. (And, honestly - between TES and Fallout, they have plenty to keep them busy.)