I demand STALKER also - STALKER SHOC, not Stalker Clear Sky - everyone plays it like some Halo clone the first time through, and gets owned.
Admittedly, STALKER - Clear Sky does the same thing, but it depends on your difficulty level. Master difficulty and I am having to do whole missions without any health supplies.
However, I have to say that the game difficulty does waver a bit. The begginning of the game, on your first playthrough or so, is very difficult. Then around the middle/end sections it goes super easy when you get a load of powerful weapons and armours, and then finally the end is pretty impossible because you just don't have the right equipment, no matter how many times you reload and try and pick up the right kit.