DXHR for $36 if anyone is wanting to jump on board - http://hardforum.com/showthread.php?t=1632156
No kills doesn't mean stealth in DXHR, it can, but it doesn't have to. Like I mentioned earlier you can be quite heads on even when playing no kills.
Try using gas grenades, concussion grenades, PEP gun, Landing System stun and chaining takedowns/stunguns, you can actually directly assault multiple people. This game actually has quite a bit of "simulation" type aspects, I did a concussion grenade to takedown assault on a group of bad guys, reminded me of SWAT 4 almost.
The PEP gun is insane, I don't know if you've tried it. It goes through targets and has an AOE radius around the projectile you fire. I haven't used it in a direct combat situation, just a test though.
Thanks for the tips. So many different ways to do things. I love it.