Well ... I have played just about every battle game out there and the User Interface on ARMA 2 is one of the worst. On the good side, they did a great job on battlefield sim if only the user interface was up to par. I got to battle 10 where I have to take 4 towns. I got to the last town and at the first outpost, I shot the only dude there and my full gun got replaced with an empty RPG (I shot it earlier). I did not select the RPG, the game did just as another guy stood up from nowhere and I could not nail him. Being an old sim programmer myself, this looks like a "I did that!" programmer routine that unfortunately sours the whole game.
The ARMA series has a lot of potential for great game play but the developers need to ensure full quality control and a better intuitive interface that works without having to get finger cramps flying over the keyboard during battle to get everything selected properly. How about a simple page menu system for major ops, comms, movements, etc... with sub menus with the most often used items. Then select a logical grouping of keys for instant access to the finesse settings ( like comm keys together, movement keys together, weapon control together, etc...)
I am also a fan of flight sim games. I don't know why Eastern Eurpoeans can develop such intricate scenarios and fail to equal Western developers in the User Controls (intuitive) department. Oh well .... just my opinion ...