You are never useless until you are dead.
If your gun/hopper/air fails then let your teammates know what is happening. Make sure they are aware of the situation. Tell them you are going to move up and be aggressive.
It works in any format, if you advance farther up the field into a position of danger to the other team, they will turn guns to you opening up lanes for your team. Pretend to snap and play even if you have no paint. Keep calling codes.
If you're out of paint - try to get a teammate with plenty to throw you a pod... Hoppers - rip drive is the best way - or just by a VLocity
Hope this helps!