I can only tell you how it was, back when i played.
Hackers were everywhere, at all times. I don't mean auto-aim or invincibility bullshit cries, that dominate competitive multiplayer, no.
I mean entire servers being teleported to a single spot, everyone dying suddenly, hacked, illegal items and many, many more.
225km2 of terrain, and you get found and murdered 10 seconds after logging in - in the wilderness - by the only other person on the server.
Following that you had people ghosting, alt+f4'ing and more, to gain advantage of the broken, garbage system that Arma runs on.
Zombie AI was utter garbage, and a day or two into playing the game, they were but an annoyance, and a potential radar against other players. Nothing else.
The anti-cheat system that the game used, was causing all sorts of issues, from compatibility problems, to multiple cases of thousands of auto-bans for script usage. Including, but not limited to, exiting a vehicle (script), turning your pistol flashlight on (script) being shot while piloting a helicopter.. And more. Followed by a day of apologies, and ban-reverts.
The entire survival concept goes out of the fucking window, as soon as you as much as look at a tent. They allowed you to stash gear, that respawns after each reset.
In between the hacker invasions, all major traffic points were hosting dozens of snipers. Sometimes people were using a helicopter on a clan server, to land on top of an otherwise unaccessible building, and then switched servers, to mow people down without being spotted.
..But on those rare, incredibly bloody rare occasions, that none of the above was true.. The incredible tension of incredibly big map with hostile players looking out for you. The incredible night battles. The insane feeling you get, when you hear shots fired (Things like FN-FAL could be heard from another dimension). The unbelievable opportunities and danger that vehicles brought. The sick cat and mouse games. The ghillie sniper duels. The full automatic silenced weapons inside zombie infested cities.
These were all amazing.
I've spent more than 10 hours playing the meanest son of a bitch imaginable. Placing bear traps and hunting people with broken legs. Sometimes i didn't kill them, but instead allowed zombies to eat them. Sometimes i just boxed them in between tank traps, after ensuring they have no weapons. Sometimes i drove over newbies with a bus. Sometimes i blew up half of the bloody city with satchels. Sometimes..
But too rare, and less frequent still, as the game went on.