Prepare to see the most disturbing, sadistic and morbid manifestation of violence that you ever seen in your life. This is the definitive gameplay enhancement mod for the GZDoom and Zandronum engines. Warning: After you see it, it cannot be unseen!
Well, to start off, this is in no way an entirely unique mod. This is not "Doom the way it's supposed to be" like you other guys say.
When you first start up the mod, you notice some new binds that (except reload) have no purpose whatsoever. The gimmick of the entire thing is to make the gameplay, as the title says, brutal, but it just doesn't feel brutal. The fatalities are way too similar to Mortal Kombat and its clones, a stiff animation that interrupts game play while you beat up an enemy and blood covers the screen. The weapons, while not useless, have many Call of Duty-isms on it, having a reload system, ironsights and all. The weapons sprites are good but the voice acting made me cut off my ears with a knife and the out-of-place special effects made my OCD go haywire.
So in short; the mod is playable but it's stiff as hell.
I suggest you try other gameplay mods available for Doom.