Wasn't even that bad compared to games that keep getting passes, like anything and everything Bethesda Game Studios puts out.
Imho the main issue was that they released it on previous gen consoles, once that became clear the meme-train just left station and kept on choo-choo-ing.
For radiation, a combination of the correct artifacts combined with good gear is how I remember dealing with that.
The last few areas were really rough I recall, with enemies with rocket launchers and snipers galore. Comparatively the NPP wasn't that bad, heh.
All in all SoC (S.T.A.L.K.E.R. in general, really) was pretty (euro)yank.
For one, it was kinda unfinished, most annoying example was that your gear would wear out, but there was no way to repair it...meaning you'd have to save up the best gear for the hardest locations, and often lug around multiple sets of things so you could toss the broken ones (only to find out the AI is actually smart enough to recognize that your almost-broken armour was better than their stuff so they started wearing it, making your life more difficult 🤣)
The second issue was the difficulty slider. The game actually gets easier on harder difficulties as it increases damage to both the player as well as the enemy pretty much equally, so clearing out locations stealthily becomes a lot more viable all of a sudden as you can now one-hit enemies much earlier in the game (but conversely, if you get caught out, yer toast)...
And then there was the little issue that you only get access to the real fun toys once past the point of no return. But that's, iirc, an issue all three games suffer to an extent.
Aaaand, now I want to start another SoC playthrough, with a repair mod
Last time I tried I used an addon that should have fixed some of the major issues (like repair), but retaining the original game's balance, while upgrading the graphics, but it also stealthily nerfed early parts of the game (which I explicitly did not want, eg. the first group of bandits didn't have shotguns any more, making that mission so much easier than it used to be it wasn't even fun)