Planetside 2, MMOFPS, actual persistent world, abilities and gear to level up, new weapons to unlock, you can even specialize into a vehicle of your choice if you so choose... wanna be a bad ass gunship pilot? Save up your cert points and get as many upgrades for the ship of your choosing. Wanna be an awesome medic? Save up your cert points and spend them on your medic gear for faster heals/revives.
It's an awesome game, I'm not much of a shooter person, but I've been playing Planetside 2 a LOT... and it's one of the few F2P games that I've ever actually subscribed to. Best part is... if you want to play totally free, you can, and you won't be penalized for it, all the guns and gear upgrades can all be acquired for free, it may take a little longer, but it's not a pay to win game. Pretty much all the cash shop only stuff is cosmetic or "get this a little bit faster" in nature.