So poison shot, then either flame wall the mobs in them for ignite, or if you're infernalist your dog will insta it when it ignites enemies, or use an infernal minion to run up and detonate them. They're pretty decent, but honestly I got a 6 link with them with scattershot and pin support and they lock most stuff down off screen so I can live.
People reporting the "critical damage bonus" nerf to mobs applied to minions. I checked my minions. Opposite effect. My minions gained 100% more critical damage bonus since the patch. Not sure they're actually critting harder, but I went from 113% to 225% with no gear/passive changes. Adding it up I get something like 117%, so I'm even more confused.
There's been a few videos of Reavers minion builds. I wouldn't recommend it. Your defenses are "hope they don't get to you" and they have 0 range. They run like 1-2 snipers for armor break poison, but no actual clearing ability. Hopefully some one figures out frost mages or GGG tunes up AI to be more aggresive/smarter, or it looks like fire style minions (arsonist vs gas cloud ignite) are going to be the tops for now.