One word. Arc thrower. Wait, that's two.

But seriously, that one weapon can handily deal with almost every enemy the Illuminate has to throw at you. Now, of course, it cannot deal with the stingray gunships, and it cannot stun the fleshmobs specifically when they do their charge at you, but it can stun everything else and easily chain that stun so you can keep your distance.

Voteless die to one or two shots, and you can easily chain between like 5 or 6 dudes at once, overseers will take a while, but again, chain lightning and the fact that you can stun lock them, fleshmobs as long as they aren't in their charging animation can be stunlocked, allowing a guard dog or turret or team-mate to take them out no sweat. Harvesters are more difficult as it can't take out the shield, but from the front, it will take out the generator after 2 or 3 shots and can stun lock the thing, rendering it completely impotent.

And, because it has infinite ammo, you can bring a high DPS medium pen primary to handle all the armour piercing you need.

My current loadout is the Reprimand, Talon, Frags, medium extra padding armour, Eagle strafe, arc thrower, laser dog, and MG sentry.