To me, the fun factor with Priest was in extreme healing situation, i.e. overpull, or respawn, in Gazluk Keep. For this, I don't think anything was OP except the fact you can have almost constantly a heal not on refresh (if you play it with another healing-oriented class, Psychology in my case). But I would hardly call that overpowered...

I did not have the opportunity to test single-tank healing, due to the rarity of pure tank builds when I played it. I suspect it would be pretty strong then, but I can't confirm.

Comparing healing in EQ1 and PG, my raid cleric in EQ was much more powerful, in my opinion. I'm comparing two toons with endgame gear and all the tricks available in their respective games.

What could be done to improve Priest:
  • Add a buff on the priest that goes off when Tether Soul triggers. It's easy to miss the chat message in a middle of a fight.
  • Allow players to see their own bars in the group window, so they can watch their own health and status, and not die because they are focusing on everyone except themselves.
  • Free Triage from the requirement of being close to the target. This is true for many other abilities (ex: Animal Handling).
  • Ability to heal without line-of-sight would change the game. I've never seen any comment related to this particular aspect of the game from devs, I have absolutely no idea if it's set in stone or an oversight...