The Developers of ARMAII developed Operation Flashpoint. So they are not a wanna be you Morons!!!
This game is Great. I also Have Call of Duty Modern Warfare, and if you are trying to compare this game with a Run and Gun type game you really don't understand the difference in these 2 games and probably need to just play COD.
I also have Operation Flashpoint 2, and I must admit, it is good, but is more polished, feels more like a game but yet also feels like a good military sim. ARMAII sometimes does not feel like a game, at least to me.
ARMAII has way more vehicles and weapons then Operation Flashpoint 2 and I mainly like the Planes that you can fly. The structure for giving commands to you squad and how they report to you stays out of the way of your action, versus in Operation Flashpoint 2, giving orders can hinder your view of the battlefield.
You owe it to yourself to buy both games if you like either one. Especially with Operation Flashpoint being on the XBOX and PS3...