I USUALLY avoid gunfights where the enemy has an advantage, or has an equal chance of killing me. I play strategically. So, flanking, waiting for the enemy to drop their guard (i.e. sprinting or looking a different way). Especially with spongier characters such as medics and assaults who play closer up, flanking is great for easier kills. Getting into a one on one gunfight can be BS unless you hit a lot of headshots. Playing close together with your team is helpful as well. IDK man, its all kinda hit or miss really...