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While Doom 1/2/2016 are focused on action, I treat Doom 3 as more survival-horror experience with significant addition of "Feel no fear... and carry a Big F Gun... "
You nailed it perfectly by adding new gameplay mechanics and balancing the old, but also keeping the vanilla movement/aim/prediction factors. Also cured me from reload "after1shot" illness.
Heh ! One Slav wrecked entire Perforated Doom 3 team ... xD
Perfection is impossible to achieve but everyone should pursue it !