I second Battlefield. 4 is a bit rough around the edges currently, ESPECIALLY on the PS4.
I'd look into BF3 if you're wary, that game is rock solid and totally rad.
Battlefield is in my genuine opinion the best shooter there is. It's not a twitch shooter a'la Quake or Tribes or something, and having a good K/D ratio helps but will in no way make you win instantly.
Playing the objective is the most important thing. Look for the Giant Bomb platoon (or whatever it's called) and there's should be lots of teamwork and voicechat going on.
Also, there's fuckin' helicopters and shit.