Well I've been thinking about this,
There are three options: kill stealer ( the hated one) the helper( the fav one) or the slaughter house ( the one that gets you the win)
I like the kill stealer because I'm a big fat jerk and because it gets you do much xp here is my build
Sniper
Boltshot ( or scattershot)
Frag
Active camo
Firepower
Dexterity
This allows you to hang back and pound in the one finishing blow conserving ammo and keeping safe
The helper
Saw
Plasma pistol
Pulse
Turret
Grenadier
Mobility
This allows the suppressive fire of a saw to add cover, you can stop an enemy vehicle from advancing to your teams Position, and ( with grenadier because you need ALOT of pulse grenades to be effective) you can make a wall to add a huge amount of cover and give a small moment of fire twards the enemy if you do this you will be the pinnacle of the team though I don't use this because if your saw runs OOA then your plasma is what's between you and a DMR D:
Then we have the slaughterhouse
DMR
Magnum
Plasma
JetPack
FirepOwer
Dexterity
With this you will smear any semi-prO ******* and he won't get revenge either you snipe with DMR and then spam the magnum when they get to close
If you want to share your slayer class then POST a reply I would be happy to see the Loadouts you guys come up with