Wall of Zombies Cost: 103 Mana / Cooldown: 8 seconds / Raise a line of zombies 28 yards wide from the ground that attacks nearby enemies for 640% weapon damage as Physical over 4 seconds. (Cooldown lowered from 20 seconds, dealt 800% damage over 5 seconds)
Pile On : Summon a tower of zombies that falls over, dealing 550% weapon damage as Physical to any enemies it hits. Reduces the cooldown to 8 seconds. (Cooldown changed from 10)
640% over 5 seconds is 160% per second is the same as 800% over 5, combined with 8 sec CD. It's a huge buff! and very much needed!
Now when you use WoZ reduction gear you can multiple walls. Or you could run Zombie Nova build. Love it!
This pretty much takes care of all the concerns and suggestions MCP, myself and the community expressed.