Skis, jetpacks, projectile and hitscan weapons and lots of them, explosives, vehicles, capture the flag, mortars, orbital strikes, vehicles, mid-airs, high speeds, chasing, grabbing, 9 classes, tons of maps, different game modes, and it's free-to-play.
It's truly free-to-play and not pay-to-win.
BTW, you'll want to make sure to have your volume up to listen for Infiltrators, if they come around (they can cloak).
I can hear their footsteps pretty good and where they're coming from with my ATH-AD700's.
I just got my AD900X in yesterday, so I haven't got a chance to really try em out yet.