Here's my opinion on tf2 (plus some bragging):
Hats are purely cosmetic features, so I could care less about them. I do care about weapons and several misc items, because they actually have attributes. Also, I made quite a few tactics here, like quick scoping (scoped headshots on a small charge), trap-stickying (booby trap corners!) and i've performed a Leap of Faith backstab while wearing a Heavy mask and being healed by the enemy medic, then getting headshot'd shortly after landing and staring at the corpse of the medic.