Can confirm having done some sybced trials with BLU, as a fill in healer its not awful, but its certainly not great. Good luck replacing any tank, its damage can spike in burst but most of those are 1 hit wonders wiith a long reuse. Angel whisper is the worst res hands down, and 1 use, non instant(still requires swiftcast) every 2 or 3 minutes. It is the opposite of overpowered imo.
They just need to adjust stat scaling, and give it a proper damage scaling weapon, it really isnt all that broken