#2 PlanetSide 2
To date, the original PlanetSide remains the most successful MMOFPS game ever created. With battles that supported up to 399 concurrent players and a persistent war between its three factions, PlanetSide was nothing short of revolutionary in its day. Now that SOE is hard at work on a sequel, you can expect them to push things even further.
PlanetSide 2 will feature more of the same large-scale combat that made its predecessor a runaway hit, along with plenty of refinements to help the franchise transition smoothly into the current generation. Those updates include a new slate of air and ground vehicles, tons of weapons and customization options, and a brand new engine. Worried that the ludicrous scope you've come to expect of PlanetSide will be lost in translation? No need to fret. SOE has confirmed that the continents on which combat takes place will each be in the neighborhood of 16 square kilometers. For reference, that's about half the size of Skyrim, and that's just one of PlanetSide 2's maps, used for a single battle. It doesn't get much bigger than that.