It's fucking brilliant!
Each type of kill produces different results.
For instance, flaming an enemy makes them drop armour, glory kills (basically punching them when they're close to death) drops you health and chainsawing them makes them drop an assortment of armour, health and ammo.
you really need to think about how you're going about your kills in accordance to the difficulty level of the enemy you're facing and your resource requirments.
Tis a great game. And RTX isn't yet implemented btw it's 'supposedly' coming in a later patch.