What role do you play in an FPS the most? Are you usually the... Charger, who rushes into fights recklessly and rips everyone apart? Sniper, who takes everyone down at a distance? Ducker, who uses a lot of cover and takes a few shots every so often? Bunny, who jumps around dodging bullets and shooting people at the same time? Human Shield, who gets in everyone's way and ends up getting pumped full of holes? Grenadier, who likes to toss grenades at the beginning of every round?
I'm usually either the sniper or a combination of the charger/ducker since in some FPS games I like to charge in with my assault rifle but I also take note of taking cover.
I do Charger/Sniper the most, I find going on rooftops to be helpful and charging into fights is what I do when I have no patience, sometimes I also do Ducking/Grenade but that's not really that much.