[Vilk]

Not really it's just that you need take care of this. They can take care of so many thing that it's not a problem to lost one attack from another of your units to drop down their number.

Additionally with experience there's many possibilities to exploit this in combat maps that aren't too small. For example the cursed ghost is thrown far to enemy lines near enemy archer and you let them do the job when you take care not have your units in range of the cursed ghost. Another excellent application is using Target on them, particularely with some stoneskin or other.

And again you have many tools to manage this problem like move the ghost in middle of a pack of enemy and not attack but defend or wait. To use or not protection spell on them. You can even use Holy Anger to weaken them, and slow on an uncontrolled cursed ghost to keep them out of range from your troops or teleport to move them out of range or even use slow on a controlled cursed ghost that you think it will be uncontrolled after their attack.

One important point to take care of is related to initiative, for example a cursed ghost close to become uncontrolled it's very dangerous to wait end of turn to let them attack if they have the best initiative so next round will have them act without to let you a chance to do something. To avoid that you could use another troop to wait until the cursed ghost has act. And stoneskin, battle cry, speed and slow that all change initiative are tool to help manage this.

I don't say it's easy to always control but with experience that's much more easy and with target + stoneskin + Magic Shield they are an amazing tool against numerous enemy long range. In fact they are quite better than horsemen for this sort of tactic expect when enemy has many priests/cardinals. For any other archer enemy Cursed Ghost are better.

With mage with High Magic in a combat with many enemy long range it's extremely powerful to start the fight with target and stoneskin on the cursed ghost and from this base there's many variation depending of enemy army. And using Archimage with them is a total must.

EDIT: And there's few objects that lower undead moral it's quite good use them with cursed ghost because they'll lower significantly critical attack chance making more easy to control them.