Corpseburster is a good set. It does competitive damage in the right hands. It is not ubiquitous or cheesy. It rewards playing to the necromancer's theme.
We need more options like Corpseburster. This isn't necessarily limited to IA class sets, but they could be a good starting point. So, how do we replicate the success of Corpseburster? How can ZOS make their class sets perform and play similarly? What went right with Corpseburster that went wrong with almost all other class sets?