If the raids aren't player oriented to make sure the individual player is at the correct level of progression then that really needs to be changed. I noticed that when my son decided to join my server (for a single session no less) and I had not even defeated Bonemass but he had on a separate game he played with his own friends I started getting the undead raids.

If that's how this works it needs to be addressed because you cannot assume everyone on a server has access to the same materials. It also should not hit them with raid levels that they are in no way prepared for. That's a design flaw.