And if you can't see how these can work in a real game then I don't really understand how you play the game.

Lots of these spots you are able to lock down 1 or 2 cap points by yourself. Any time you hear that the enemy is capping a point you can rain down nades from pretty far away thus being mostly safe. Couple the tubes with OMA and you basically have infinite ammo. With Danger Close, your getting doubles and triples from every other shot.

This shit works and is effective.