EdgeCase (LOTRO Dev) has posted on the Official LOTRO Forums to outline the thought process on the recent Guardian changes and to solicit feedback from the player base. Now is the chance to have your say !!!

Some Key Points:

Guardian AoE DPS has been nerfed. Was it really ever out of control?

With the changes to taunt mechanisms back in U16?, and the reduced targets with Imbuement, it became necessary for a Guard to use DPS as a method of holding aggro. How is this AoE DPS nerf affecting your tanking?

Guardian self heals have been nerfed. This is a change that most Guards saw coming. It should not be possible for a class to solo 12 mans (i.e. Flight).

https://www.lotro.com/forums/showthread.php?624387-U18-1-Guardian-Changes&p=7599336#post7599336