The combat in this game just lights up my brain with the feel-good chemicals like nothing else. The balance of zipping around the map, unloading the considerably large arsenal to dish out damage, regaining health, and armoring up while constantly updating and adjusting my tactical plan of execution on a second-by-second basis is sublime. I have a laundry list of problems with the flabby experience Id Software built out of that combat, but it ultimately does little to obstruct the high that playing this game at its best gives me.