I just wanted to post two changes that I think could really set the Guardian up to be even better support.
1. Healing Breeze should be a full frontal cone and increased range. I would like it to be instant cast but that would probably put it over the top. This would allow the Guardian to better apply heals to dungeon groups that are spread out.
2. Symbol of Swiftness should be changed to a symbol that reduces condition damage, buffs condition damage, or something other than speed. Unless the speed buff is necessary for some dungeon I have yet to do.