Best milsim experience out there imo. Yes it can take a bit to get into,if your anything like me,you'll have zero idea what your doing especially since i played solo at first. this game is not for everyone. its slow,sometimes a walkling sim,etc. but for those who it is for and for those who are patient to learn the game its a absolute buy. No session is the same. From flying on a Heli to capture an objective with your friends and getting blown to pieces before you land,to lying down in a bush a solo killing the whole enemy team as they frantically cuss you out in voice com bcuz they dont know where tf you are ,to just ♥♥♥♥ talking over platoon radio with your squad, This game is a must play.

Disabled Family Share like a bunch of chumps = no recommendation from me.

There are glaring issues with both the base game and the modded/privatized side as well. I will illustrate both as a buyers beware.
Base game issues:
Performance: Arma Reforger is not easy on your computer. That doesnt just mean your 4060 card cant run 4k 144fps on maximum settings. It means that even PCs that are powerful by todays standards suffer frame drops, freezes, memory leaks, and overall strained graphics performance. This is due to a few things, primarily. The first is the game engine, enfusion. The second is the 'Texture Streaming' rendering system, which actively loads assets as they appear on screen. This is presumably to avoid giving players loading screens as they respawn or access inventories. The consequence of this is that you absolutely CANNOT store this game or any of its mods on a standard hard drive. YOU ABSOLUTELY HAVE TO STORE THE WHOLE GAME ON AN SSD storage card. The game is not playable on physical storage drives. The third issue is optimization. Arma is engineered to be CROSS COMPATIBLE WITH CONSOLE. Therefore, it has to compromise Computer performance to work with Xbox and Playstation too. And thats just for the core game. Many modders are not professional. They make stuff they like because they want to create and share with others, but that doesnt make them experts on video game development or optimization. The more mods or assets a server uses, the worse the game will perform.

48 player lobbies only, and a gigantic map. good luck finding enemies. With a 50km playable area and dozens of objectives, and several afk or driving players, youre rarely within one kilometer of an enemy.

Conflict game mode - the exclusive base game mode, is horrendous for gameplay. When you capture an objective, your radio signal expands to reveal more objectives. Sounds fine, but theres one asinine balancing decision which destroys the gameplay - you can respawn on objectives you control, but the second the enemy outnumbers a base's defenders, you can no longer respawn there! This means that under practical gameplay conditions, you can spend an hour defending and building up a strong point, only for a car to pull up at the edge of the capture area and deny respawns. Instead of an intense battle for the objective, you get a skirmish, at best. What happens more frequently is that one team attacks an objective, only to find it empty, forcing them to sit and wait several minutes, minimum, for the "defenders" to arrive and stop them from capturing. You see the problem here? The attackers become the defenders the SECOND they outnumber the attackers, regardless of any fortifications or strategic nuance.

DDOSing: More of an issue for private servers, but it is a core game element so ill mention it here - the servers experience DDOS attacks, mostly during peak hours in the afternoon and on weekends. In a game where you spend the better part of an hour just slowly capturing empty objectives, this quickly becomes a nightmare to deal with.

Modded/Privatized server issues:
Arma Reforger supports 3rd party modding and server rental and even provides the infrastructure to support modders and mod patrons through the game. However, there are some glaring issues facing the modded community.
Bohemia Interactive relations: BI terms of service prohibit modders from making money from their labor. When you develop or maintain a mod for Arma Reforger, you do so with your own free time.
Mods, predictably, are rarely high quality or fully functional. Many are glitch, often for weeks, months, or even forever. Due to BI TOS, you cannot publish fixes or addendems to other users' mods. Therefore, modders are exclusively responsible for not just the functionality of their own mods, but the compatibility of their mod with anyone elses as well. For example, a picatinny bipod attachment is not compatible with all picatinny rail handguards on rifles. That rifle has to be adapted to accept that bipod by the developer of the rifle. Another problematic one is night vision. Some night vision mods cant see IR light. It just puts a bright filter on what your screen has already rendered. Additionally, every modder has a different mindset on balancing or compatibility standards. Two visually indistinguishable rifles available on the same server can have completely different recoil patterns, ammo availability, optic capability, ads speed, etc. This is all to say that youve probably seen some really cool mods in Arma, but most of them are either glitched, incompatible, or unavailable on individual servers.
Servers: Servers with mods or the coveted 128 player count are all privately owned and operated. They are required by BI to enforce BI TOS and community guidelines, but the issues plaguing other games that use private servers persist here too. Abusive admins, obscene player communications, griefing, and more are commonplace. Add in the fact that BASICALLY ALL SERVERS ARE CROSS COMPATIBLE WITH CONSOLE and the standard of play drops even further. Yes, consoles have equal access to Arma mods and servers as PC users.

The game is still fun sometimes, but you gotta know what youre getting into. For $40 USD, youre getting a game that doesnt perform very well, and leaks memory. You have to download mods and play private servers unless you want the husk of a base game experience. The few servers you find that you like will either have a 20-40 minute queue or be empty depending on the time of day. You will drive or walk for several minutes to get anywhere, and there will rarely be enemies to meet you. When you do get in fights, they normally end quickly and leave you repeating the drive around part over and over. You may go all afternoon seeing nothing more than occasional skirmishes. Getting consistent PvP requires you to hunt players by disregarding objective play, perpetually seeking out your next firefight rather than waiting who knows how long defending even the most important objectives. Competent or useful team radio communication is exceedingly rare. The combined arms logistical aspect of the game incentivises oblivious players to spawn repeatedly wearing expensive loadouts while the seasoned, considerate players strategically limit their redeploy cost.
If this all sounds frustrating to you, thats because it is. This game does not function in any capacity as a proper milsim game. The more ignorant and oblivious you play, the more engagement you will get with it. Contrary to that, playing strategically usually means making personal sacrifices thanklessly, staying behind to defend objectives alone, running logistics to captured bases, shying away from expensive gear, and otherwise going off away from the action to do monotonous tasks rather than enjoying the game.

TL;DR - I'd only recommend this game to people with tempered expectations of game performance, milsim experience, or fun/engagement in general. It has potential, but you are guaranteed to waste some hours getting nothing out of it, then try again the next day hoping itll be different this time.