Need I say more

Go try it out, it's every bit as Brutal as advertised.
http://www.moddb.com/mods/brutal-doom
You will need the .WAD files from the original Doom games. Those who own Doom on Steam will find those in their Steam folder.
Below is a thorough guide to set up Brutal Doom with all high resolution textures and an entirely redone heavy metal soundtrack.
http://www.mattloveswriting.com/how-to-install-brutal-doom/
If you guys need more incentive, I'll just leave this here: