I agree with everything other reviewers pointed out, just one more thing I would like to add.
The final drop that spilled the ocean for me was AI. I remember years ago when I played this game....sometimes, you were supposed to fight with your desired faction but weird and highly annoying stuff happened like your own ally pushing you out of your cover because he intended to use it. And obviously, that wasn't the intended game mechanic, that was another developer oversight. I like the idea of fighting with other groups but it was poorly executed.
Also,when enemies threw grenades, they tended to kill themselves or throw them at impossible angles with perfect 100% accuracy. And what I mean by that is, almost every grenade will hit you in the face, not just land close to you. Popular mods for Shadows of Chernobyl that gave enemy NPCs ability to throw grenades have the same problem, but the developers didn't bother to fix it and probably thought it's good enough. Acceptable for free mods, but unacceptable for a paid product.
Call of Prypat fixed all of that, you should buy it instead and skip this one.