Misery was slightly challenging, but the rest was very easy. The reason I found those games easy was because once you hit a certain amount of minimal requirements (any decent shooter, decent amount of health packs and even crappy suit above leather/bandit suit) it is easy to asses the situation form a distance and pick enemies off rather easy (in terms of corridors, it is even easier as grenades are OP here).
Dead Space does not allow you many times to think things long enough (especially as I play by always selling everything I have except 1 full clip for the plasma cutter, i run away, melee or stasis if things get dicey). I know I could carry 5 ammo racks and 10 medkits but that would be way too boring
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I mean Stalker shadow of chernobyl 2009 mod ( i think that was the name) as well as lost alpha, and clear sky complete.
As I said Misery was slightly better in terms of survivability, but one thing that bothered me a lot was the forced blur and excesive recoil of weapons in some cases.
It felt as if you were a nerd trying to fire a gun, not a soldier
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I still love the stalker series (got all of them), but once you get that real "starter armor/gun", the game does go downhill a bit.
Now Im playing some Alice Madness Returns. Id rate it a 6/10. Most of the time it is repetitive but it has some decent highlights.