I heard a lot of good from Arma 3, is it like some kind of more elaborated sandbox-insurgency ? I seriously consider buying it.
Something like that in short. Much more of a military sim than Insurgency, a lot more weapons, vehicles, missions, depth to combat and absolutely huge maps. Very sandboxy. And the best thing about it, modding and player made missions, which basically means you get a shitton of different games, from racing missions, a better DayZ and DayZ-like mods, persistent RPG mod, GTA-like mods and a bunch of other PvP, PvE or PvP/coop and more serious milsim mods and missions. There's a ton of content.
Few to mention:
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EUTW CTI (currently my fav), Capture the Island mod, where two teams of players are pitted against each other to capture multiple objectives from eachother, earning money for every player with which you can purchase new gear, items and vehicles
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King of the Hill, basically the same as EUTW CTI, except you fight for one objective only, but the money you earn is persistent (not only round based like in EUTW) and you also have experience, levels, perks and equipment that specialize your character (also persistent). Kind of like cRPG for Arma 3.
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Breaking Point, pretty much DayZ in Arma 3
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Wasteland, spawn naked with pistol, loot around the map for guns and other items, shoot other people, complete randomly spawned missions/objectives. DayZ-like, only faster paced and more emphasys on missions
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Invade&Annex, COOP, run around the map with your team to assault AI controlled points (AI can be deadly in this game)
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Battle Royale, get dropped from an airplane to an island with a bunch of other dudes, loot guns, be the last one surviving while the area of combat become smaller and smaller
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Altis Life, GTA-like mod, more of a roleplaying mod, you can play as a civilian, criminal or cop, all depends on your actions of course. You basically try to earn money, either legally (picking up fruit, mining, etc) or illegally (harvesting coca plants, refining into cocaine, selling cocaine, killing and robbing others etc), while the cops try to stop you (if illegal). And then you can buy stuff like houses, better cars, guns, etc with the money. Quite a lot of different stuff to do there, but the community can get toxic.
Few things that might put you off: game can feel clunky/is not as smooth, fast and responsive as more arcadey shooters (due to realism as well I guess), it has a slower pace and you need a monster PC to run it on higher settings.