The one big buffed minion build is nerfed(and it should be!), but i think that part of the problem is because the only build possible for the abomination is to buff him and/or summon another minions for him.
I suggest making the abomination skills from the nodes “Dead Eye”, “Spoils of War”, “Bloated Corpse”, “Corrupt Palate”, “Shattered Similacrum” and “Reap The Dammed” get affected by other skills.
“Dead Eye” should scale with Marrow Shards
“Spoils of War” should scale with Transplant
“Bloated Corpse” should scale with Summon Volatile Zombie
“Corrupt Palate” should scale with Hungering Souls
“Shattered Similacrum” should scale with Summon Bone Golem
“Reap The Dammed” should scale with Harvest
And Would be a good idea to change part of the abomination damage if it absorbed a minion that is doing a damage that isn’t physical, and add a node for Rogue(that following the same idead as above, makes the abomination use the rip blood skill tree).
Another thing that makes some sense is to change “Age of Undeath” to reduce the decay according to how many minions he consumed and how many minions is alive(of the type he devoured), example if he consumed 5 skeletons , 4 mages and 1 golem. He will receive -100% decay if no skeletons, mages and golens is summoned, if one skeleton is summoned it will have -90% decay, 2 skeletons -80% or 2 skeletons and 1 golem -70%.
I also suggest adding some synergy with another minions
Skeleton: Should scale with Rip Blood(Rogue), Marrow Shards(Archer) and Transplant(Warriors)
Skeletons Mage: Should scale with hungering souls(Mages instead of knights, also the pyro and cryo should change the damage) and Wandering Spirits(Death Knights)
Summon Bone: Should scale with bone curse(bonye)
Summon Wraith:Should scale with Harvest
With these changes i think we will see more ability with minions builds also would update some old skills that need some change.