Not every game will appeal to everyone. Arma is a different animal to DayZ now and I would expect after the game goes to Beta and modding starts, you will find someone developing an Arma 3 killer for sure as visually (even without the new graphic engine) the game is stunning.
I do understand why people struggle with the point of the game and of course it does lack this ‘end game’ driving force but in a way, that’s what makes it realistic; if you found yourself in the position of being hungry and thirsty with nothing but a rag and a flare in the middle of a foreign land with infected, wolves, the environment and even other players, all stacked up against you – surely finding a way to survive is drive enough until other factors are introduced?
Then there is looting (which I find incredibly relaxing, weirdly), negotiating the 225 km2 map with various tactics needed to approach key points. There is talk about introducing a class ranking system for things like hunting etc. For me, one motivation would be hours survived as although the end point for most is to gear up with full military kit in the north west and find PvP but the freedom the game brings has led me to try and survive from just food found on zombies and fishing (no apples), get to the north west with nothing more than a chambered pistol and bow and arrow, do a complete lap of the map, discover loot routes based on spawn point – for me the options are endless which is what I like.
I don’t have much time to game these days so looting a town for ½ hour and then log off can be entertaining in itself but more often than not I enjoy being a fresh spawn and see what interactions I can have on the coast.
All this one has to continually remember that t is an Alpha (yes it's become a bit of a standing joke) but for me, I came to the game well into 0.60 so it has been a very different experience for me than most that have played it with later 0.5x patches.
Base building is due to come in, as well as more vehicles (push bikes and motorbikes) as well as planes and helicopters, with the likelihood of boats coming as well.
The sheer scale and development of the Chenarus map as well, sets the game aside from others. It’s nearly 3x the size of GTA5 map for starters!
The interaction of the game is such that this alone would keep me coming back and is something that I have never found (or even wanted) from another game. Miscreated is a different animal and nowhere near as good. Arma 2 mods are obviously the closest but even with the updated Arma III, I simply struggle with the issues that Bohemia refuse to fix (hitbox and so on). With all it’s faults, DayZ SA has so much potential, I just hope real progress can now be made since hitting the recent engine milestone