Having played planetside on and off for several years, I dont really think you can distinguish the multiplayer pay to play side of GA from the sounds of it from planetside, other than to say its new and shiny.
Planetside, you can join outfits to raid with friends, you level up to gain skill points which allow you to gain the proficiency to use different armor and weapon loadouts, and run varying different vehicle's and vehicle loadouts, culminating in the Battle Mech proficiency for getting all the relevant skills and completing the cavern achievements. Hell, as the vanu sovereignty your MAX and mech suits even get jump jets