I am not a numbers guy, but my GS can defend the door on Voidstar or a turret in Civil War by himself until help arrives.
I don't top the charts, but I do alot of fun stuff.
I stun all the time with leg shot and flash grenades.
Yes my concus has to be from cover, but that is just a challenge and when it works, it is Awesome to send guys off the bridges or the top rails.
If you try to focus on just one guy, you will die and do nothing.
I spread the pain. DOT everyone near me, flash, pulse and then Flyover the group and watch the numbers scroll. Sure, only a few may Die, but the rest are a easy mop up for the rest of my team.
as for the OP saying we have no Health? I rock over 18k in WZs with my single buffs and do 7k - 9k damage with primary.
1500+ cunning and 1500+ end 4200+ armor.
Besides doesn't really matter if you cannot have fun, change to a differant character.
GS needs some help, but they are FAR from Useless in PVP, maybe you just need more practice and new tactics?
Stop counting the numbers and just enjoy.