Yeah search didn't turn up any major threads for this and I feel like EXPRESSING DISAPPOINTMENT.
Recently, I reinstalled DXHR and started a "Massacre every enemy possible" run, and I'm finding it somewhat saddening that nobody seems to acknowledge this fact in-game. I wiped out an entire factory full of terrorists? "Gosh, Jensen, you KILLED THE LEADER? And you SAVED THE HOSTAGES? Those sure are the only two variables we respond to!"
"Gosh, Jensen, you just massacred an entire building full of police officers? Then you repeated it in China? Better NOT MENTION IT AT ALL!"
Maybe it's a small nitpicky thing, but I think failing to do that sort of thing where the original Deus Ex did it is... well, one of many problems, including:
Overprivileging pacifist runs. Taking someone down nonfatally gives 20 extra XP. The base is 10. Takedowns add 20. This means a fatal bodyshot gives 10 XP and a fatal headshot gives 20 while a melee nonlethal takedown gives 50. Oh, and the prod is now ranged and takes down any enemy with a single hit.
Overprivileging takedowns. They cost you 1 energy and your bar naturally regenerates up to 1 energy. Ignoring that, a deadly takedown gives 30 XP against 20 for a fatal headshot, 10 for a bodyshot (as above), and a nonfatal one gives 50 against those numbers (again, as above). They can take down any enemy except the bosses (which are their own problem I don't feel like addressing) in one button press, which I suppose isn't too unlike the Deus Ex Dragon Tooth Sword.
Making nonlethal takedowns strictly dominate lethal ones. There is no reason to ever use a lethal takedown. Nonlethal initiates faster (Tap the button instead of hold it), makes less noise (Lethal takedowns cause loud shouts from the victim, while nonlethal ones are silent are as near so as to make no difference), and gives more XP (lethal takedowns gives 30 X; nonlethal give 50).
Making the sniper rifle and combat rifle suck. Both are lethal weapons, which means you lose 30-40 potential XP per kill you get with them. The former is too loud to really matter in the cramped urban environments of DXHR. The latter just doesn't do a damn thing until you have it fully upgraded and even THEN it still has trouble dealing with highly armored things. This problem is related to...
Making the basic pistol the best lethal weapon. Laser sight makes it super easy to aim and the armor-piercing modification makes it an instant win item that will silently one-hit-kill any and every non-boss enemy with a single headshot at pretty much any distance; it takes fewer upgrades than a combat rifle to be useful (The armor-piercing mod you find in your apartment at the beginning and any damage mods you stumble across as you go. That's it) even if it does benefit from other mods. It also doesn't require any combat augmentations (recoil reduction, gun sway, etc.) to be useful, unlike the combat rifle.
Oh, and windowed mode has made memory leakage.