The ammunition counter is different than any other game I have seen, and at first I hated it. Instead of an accurate magazine count, the counter shows total rounds in your inventory. It is up to you to count the shots as you fire them off. A small graphic of the weapon magazine gives a rough estimate of the remaining ammo. At first, I thought this system sucked, but I realized that in the real world I have to keep a mental count of how many rounds I have fired, so this is actually a logical approach.
Situational awareness is the name of the game.
One thing that sets this game apart, is the ability of some of the weapons to shoot through walls and doors, depending on the construction material. It's actually pretty cool to hear a terrorist inside a room, and let loose on the wall with an AK-47. The scope effects are very well done, and when zoomed, completely block all peripheral vision, unlike the arcade-ish view in Land Warrior. Taking down terrorists at 800 meters is no problem, and fun, of course. I would have liked the option to lay prone when firing to present the enemy with an even smaller target, though, since the AI seems to cheat, more on that later.