Currently, there is only one damage visual decal in the game--for bullets (its is a very bad texture and its almost unnoticeable).
I would like to see some real damage on vehicles, buildings, and objects when you hit them. A rocket or grenade should show visible scarring on a building, vehicle, or tree. Bullets should make much more noticeable impact marks on all objects, and dents and scratches on armored vehicles. Windshields should show bullet holes or cracking.
This is a small request that could make a big difference for immersion.