Spending enough time in this game to fully appreciate the good and the bad, I have decided to put some words down. I love this game more than any other game that comes to mind.

Where do I start? I'll start with the hard stuff.

You will stuggle with this game. You will have moments where you hate the way it's coded. You will die to stupid things, like stairs or rocks. You will hate the fatigue system and the weapon sway. You will get annoyed at the reskins for outfits.

Eventually, you will mod it.

This is not a simple run and gun game. You will not find yourself 'no scoping' after sprinting for 2 kliks. Arma 3 is a simulator first and a game second. The groundwork is solid for the most part. The modding community is devoted. The game modes are varied. There is something that almost everyone will find appealing inside this package.

Halo jumping dressed like the UK Special Forces? Check. Thank a modder.
Driving a hatchback that's colored like the American flag? Check. Thank a modder.
Want to build a mission around the Tet Offensive? Check. Thank a modder.

Am I biased? Yes. Do I have a huge amount of respect for modders? Yes.

Arma 3 is a cpu intensive game. You will have to tweek the hell out of it to make it just right. You aren't going to get 60 fps on poorly coded MP servers. Please don't think it's your hardware, it's not. Well, probably not.
But this game really shines in the graphic department once she's setup just right. I'm constantly trying to squeeze as much performance as possible, but I'm not going to go over everything I've done, it would take too long. If you google it, you will find it.

Playing the game by yourself is hindering your fun to an extent I can't even explain. Ok, since you asked so nicely, I'll try.

Playing to campaign alone left me yearning for more. I really disliked the interface when assigning targets, or handing out orders to the AI squadmates I had been shackled with. It doesn't feel very fluid, nor does it give me the feeling of teamwork. The AI, at times, can go 'full ♥♥♥♥♥♥' and just stand there while being mowed down by the enemy forces. You may order them to get into the truck you're sitting in, only to find one of them has the great idea to run right into the AO and alert everyone to your presence. Ok, I guess stealth is off the table. At least I have superior numbers? Ha, they won't get out of the truck and that rpg is headed this way. I'll just reload my save then.

Now, replay that with real people that communicate and know how to play. Completely different outcome. I'm not typing that hypothetical situation out again, just trust me.

Now, onto the really fun part. That part that makes my genitals tingle.

The Mods.

OMG Becky, look at those mods. They're so big!
No, they aren't all large downloads. Even some of the smallest mods can change the game to a large extent.

Take AGM for example. It has different frag throwing options. A medical system that includes epi's, blood bags, adrenaline and the ability to drag people to safety. No longer can you see how many rounds are left in your mag, you can only 'see' the weight. It has weapon resting, fast roping, cook offs, vehicle repair options and a bunch of other things I can't think off.

What about vehicles? I really like the hummvees from Arma 2. There are a few different options for mods for that.
Do you hate that you stop moving when you switch weapons? There's a mod for that.
Tactical glasses have no use in the game? There's a mod that gives you a hud when wearing the glasses in first person.
I hate the stock sounds. JSRS3 baby!
Want a Canadian mohawk? Reskin mod.
Tired of playing Altis or Stratis? Bornholm, Tilos, Chernobyl, Chernarus, Utes, Panthera. Just to name a few of the many user made maps available with a few clicks.

Be warned.
Mods don't always work 'right out of the box™'. If you don't have patience, you're just going to have a bad time. Sometimes mods don't work well with each other, or give you graphical errors, or aren't compatible with user made missons. In short, when they work, oh baby do they. When they don't, you deal with it or stop using them.

Look, I'm biased. I really am. I love the milsim aspect of this game. I love the squad play. I love the vehicles and the guns. I love the guys I play with.

They say that the best things in life are the things you have to work for. That's what Arma 3 is.

You have to work for it. But it really shines in the long run.