I aimed down sights a lot, even if I should of knifed. However, my biggest vice (and I don't believe its on this list) is that I'll shoot a guy up, and from past experiences, I'll assume I've shot enough that he's dead, but I don't get any notification of this, and I'll freak out and turn back to him to put the last bullet in. I'm also number 1 noobtuber.
Sorta headless chicken, sorta ADS guy. I hate spraying, and basically only hipfire just outside of knifing range. And I usually have a plan when running around, but I'm not as cautious as I should be and get killed a lot more than I should because of it.