Played a lot lone wolf style, but that's not to stay I wasn't tactical. It's situational, really; the gameplay is fast so I'm switching between offensive and defensive play a lot. Of the general things I do, one important one is to watch your motion tracker. Someone's too close, take out shotgun and two-piece them (Shotgun followed immediately with a melee attack). If there's no one around on the tracker, move so that they are. Keep track of where your team is and isn't. Movement is important; running and jumping are vital to get into powerful positions quick enough, but you don't want to be caught on the move in a firefight, especially at mid-long ranges. At longer ranges the motion tracker is not as clear on where the enemy is; use this to your advantage. When in mid-long range fights, switch positions when you need to, and then dig into a position for the accuracy bonus and hopefully a kill. Don't be afraid to back off; if possible, get aggressive. Flank wide and pinch off the enemy with your teammates. Use grenades as both area denial and to help down enemies, they are very useful. Map knowledge also helps a lot.