Argo vs Planetside 2
Argo
Argo is hardcore tactical MMOFPS that is, according its developers, a free total conversion of the popular Arma game franchise, specifically Arma 3. Although the franchise itself as not reached mainstream popularity like Counter-Strike, Battlefield, and Call of Duty, it has a niche and dedicated fanbase that you'll probably see a lot of while playing this game.Featuring a three competitive game modes and one 10-vs-AI cooperative mode, the game is set in the Mediterranean island of Malden that houses a range of combat zones perfectly designed to fit each mode. The game even has a built-in 3D scenario editor that allows you to create your own missions and other content for Argo players to enjoy!
If you love military-themed shooters, Argo is a pretty solid game to play. After all, you'll get to experience a bit of the famous "Arma gameplay" for free.
Planetside 2
Planetside 2 is a sci-fi-themed MMOFPS game that's the explosive sequel to its predecessor, Planetside, which was released back in 2003. In a way, the game is more inclined towards the extravagant and yet is still rather down-to-earth mainly because it features massive battlefields where hundreds to even thousands of players can battle it out for their faction. In fact, the game has an exciting gameplay which may bring to mind the games in the Battlefield franchise albeit the futuristic sort.Not to mention, Planetside 2 has an actual war playing out on the map where players who won a certain battlefield will essentially "claim" the land for their faction. The tug-of-war-like power struggle between factions help to bond the players in a way that resembles the deep rift between the Alliance and the Horde in World of Warcraft. The game is also developed by Daybreak Games which is in pretty good company along the likes of EverQuest 2, DC Universe Online and Lord of the Rings Online.
So, if you're looking for an epic MMOFPS game to fully immerse yourself in, then Planetside 2 is your best bet. If not, there are plenty of other casual shooters out there, but you can definitely expect that none of them can measure up to the faction-vs-faction tension, which usually erupts into another battle, offered in this game.