I never played MAG, but it sounds a little like Planetside 2 which is a MMOFPS. I've only played it on PC, but there is a PS4 version. For those that don't know, the maps in PS2 are gigantic, about twice the size of Manhattan, and divided among three factions. Territory control is the meta-game, so k/d is meaningless. Landmass is what's valuable. For example, capturing an enemy Tech plant can deny them the ability to spawn main battle tanks and awards points toward locking the continent - the ultimate victory. The maps are seamless and completely open world. Joining a large +98 vs +98 battle is common, and locking down a map can take several hours to a day or more.