Sniper = Stealth, so having stealth as a seperate 'playstyle' is redundant. While you can use stealth during any of the other playstyles, it is most useful for setting up sneaky headshot situations when sniping. Stealth isn't really a seperate playstyle in and of itself... it mostly just compliments whatever weapon type you happen to choose to play with- if you decide to even use it. Personally, I use stealth no matter what weapon type my char has majored in- getting the drop on your enemies and good positioning *before* the fight starts, is key to winning battles whether you are sniping, stabbing, or lobbing explosives.