I think I'm starting to get the hang of this, but I still feel like I'm doing something wrong. Perhaps someone can help me. I set up my base of operations did maybe 2 story missions after that, and decided to start by working on my medical bay. I'm now a level 6, with the best weapons and armor the vendor is selling at the base.
I hover over side missions on my map, see one called "virus research" which says 2-4, which I'm assuming is the recommended level. It leads me to the backyards of people's houses, which all have wooden fences. I slowly make my way down the path, killing people, but this one guy shows up with a yellow energy bar and nearly one shots me every time. I spend forever chipping away at him and hitting him with grenades and the fucker won't die. He eventually gets to me and I'm killed. What am I doing wrong?