Here's a trick for the financially challenged to get ARMA 3 ~50% cheaper without waiting for a steam sale.
Buy ARMA 3 Alpha -> wait till release -> download finished game = profit
Or if you have an issue with any of this then the game is not for you anyways and you should play one of those other games which only has buttons for running, jumping, teabagging and shooting.
I also saw a brilliant post on the forums the other day:
I bought this today. And for the love of god I dont understand what this game is for. I see you have some stuff called showcase which I assume are simple missions to show what the editor can do and what you can do yourself. I scratched that off my list of to do things because I dont like playing with or against AI.