Just as in real life you don't just rush into a firefight and don't expect close quarter combat unless of course they added that in this new installment. Its an open environment for the most part, only a few spots in each level for ammo(at least in the older games). Slow and steady wins the race! It's a fun game but I hope Codemasters put more into this especially on the support side with patches and updates.
Operation Flashpoint Dragon Rising was released unfinished and had terrible support, the DLC was crap and released way too late, after most people lost interest. I am really hoping for much improvement on a possible great game.
If you have never played Operation Flashpoint games don't expect the same old FPS. This is as real as a game gets; strategy, teamwork, etc. If you're major fan of COD you will most likely find this game too slow and boring. A mission can take up to 45 minutes to an hour. Strategy is key.