Destiny sniper rifles have no bullet drop. You can snipe a headshot easily from a mile away. I think including bullet drop in guns increases the need for more skill based shots and increases the competitive gameplay as well as realism. Also, it will force diversity in the types of guns and will force the user to think a little harder on which guns to use.
One can argue that sniper rifle ammunition is few and difficult to find. Additionally, combining low ammunition with bullet drop may make it too hard too snipe or even utilize the sniper rifle.
What do you think?