Tier List

S Tier: Seeker
Seeker brings the best group damage buffs of all the options, and therefore is the strongest option currently. A fully built Seeker provides almost as much safety as Oracle while providing wand buffs like Janice's Rage and Enchanting Time, as well as the new bow passive and Sacred Circle skill core.

A Tier: Oracle
Oracle is fine this patch. The main issue Oracle has is that its group buff (Seer) was nerfed awhile back along with Guardian Satellite, and you can now no longer benefit from it if you want to cycle shields. Add onto that the buff bow received in its group damage boosting passive skill, and this class has lost a little bit of its footing in comparison. That said, this is still a good class, and if bow DPS become meta this could actually take over as the best healer, or at least on equal footing with Seeker. Any time you have no Deadly Marker though, Seeker is much better.

B Tier: N/A
Nothing worth noting here.

C Tier: Scryer
It's sad, but this class has never been less justified. Overall tuning is harder right now which means the lower healing and shielding capabilities compared to Seeker and Oracle combine with the lesser group buffs to produce a class which is just overall not worth bringing in its current state. Wand buffs are extra juicy this patch with Sacred Magic Circle, and Deadly Marker doesn't even justify this class over Oracle in my opinion. It is technically playable, but not competitive. Despite orb passives to boost the Shield Health, Distortion Veil is just overall bad, with a measley ~6 second duration compared to double that for Invincible Wall, which both Oracle and Seeker have. A Shield Health Seeker build with Cordy just blows this class entirely out of the water.

F Tier: Invocator, Enigma, Paladin, etc
Nothing with only one healing weapon currently justifies itself.