Okay so, I've been playing this game for a while and it's really cool. And as far as I'm aware there is nothing else like it right now; pretty much the only example of an MMOFPS. Hundreds of concurrent players all fighting on the same landmass, with access to one of either 5 classes (Light assault, heavy assault, medic, engineer, infiltrator) and a number of ground and air vehicles.
It's pretty massive, and it's quite awesome.
It's Free to Play as well. And no, don't worry, it has done a good job avoiding the "pay 2 win" nonsense. You can unlock weapons with station cash or Cert points you get by actually playing the game, and anything else requires certs.
Personally I'm a TR character on Waterson. We have miniguns. *nod*
Edit; Oh, by the way, if you do decide to play; join squads and platoons, particularly platoons run by outfits and try and join an outfit you would like. If you are rolling alone in Planetside 2, you are not getting the most out of the game.