Seeing how everyone is going nuts, I've decided to make a list of things that will help to make Whisper useful. You need to spec your armor with the perks and mods below.
1. Armament Mods
2. Sniper Scavenger
3. Sniper Reserves
4. Grenade Mods
5. Heavy Ammo Finder
Using these perk and mods will allow you to find more ammo and carry more ammo while also giving you chances to get ammo more often. Taking advantage of these perks are a must now. Use them wisely and you shouldn't have to worry, long as your teammates don't steal your kills.
Leave a build combo if you have one so people will know what to chase after.