I just bought Operation Flashpoint 2, the PC version, from Steam. I have completed only the first mission in the single player campaign game mode, and I'm already a bit disappointed.
The main reason for my disappointment is that it feels like a clumsy console port - I think the developers would prefer it if you used a gamepad rather than a mouse and keyboard. You can tell from how you have to laboriously navigate through the pretty but slow menus, and the amount of bugs related to keyboard mapping (check Google, my first one was not being able to exit the Inventory screen menu because I had remapped the Use key). Also at times you can't scroll or right-click on the in game map, making the map completely useless. Restarting the game seems to fix it.
My second disappointment was the AI. Ok, this is a game with huge maps, and you may want to travel large distances with your AI team mates, right? OK, so let's get in a jeep (fiddly with the "quick" menu) then go to the map screen. If the game allows it, you may be able to scroll the map to the location you want to go to. In my case it was to the top of the initial small Island. After right-clicking on the location and selecting move-to, I wait and watch. After a small delay (presumably path-finding calculations) my driver sets off with all of us in the jeep. Cool, I think. Then he veers off the road into the woods, and gets stuck in a bunch of trees, inching forward and reversing in a never ending circle.
This is very, very poor.
I exited the game at this point; not going back till they patch it.