-Make the player character NOT a gun totting pro. Make it so that he fumbles when trying to reload or his aim is off at times.
-1 word: GOAP - it stands for goal oriented action planning. It was used in FEAR back in 2005 and nothing else really. lol. The idea is to give the AI a goal and allow it to figure out the best way to reach that goal, instead of giving them a set of instructions
-I like games where I’m a badass doing badass things, not the realistic ****. I liked the new DOOM for that reason.
In short: copy DOOM ('93 or '16 version) lol.