When I play games I normally choose to not kill people if given the option. I've been playing through so far using just the stun gun and the tranq rifle but I'm starting to think it may not be worth the effort. There's hardly any ammo for these weapons lying around and I'm not really patient enough to be super stealthy. I'm only a couple hours in but my current mission is starting to frustrate me. I'm on the mission where I just found the guys who were responsible for the initial attack and I have to find the leader before they all leave.
There seems to be a ton of enemy dudes and alerting one gets all of them on my ass and my only option is to run and hide and then wait until they stop being hostile towards me. Should I just start killing everyone and stick to story choices that let me kill or let someone go?
I've also only upgraded hacking stuff so far. Am I going to screw myself by not having any combat upgrades or not carrying any lethal weapons?