I actually think that Melora's Tide needs to be nerfed in the outside encounters sense. It's silly that one feat can effectively can provide so many extra healing surges worth of healing. In combat I think it's okay, especially in the hands of a cleric due to healing lore.
Healer's Lore only applies to Cleric Powers. Melora's Tide is a Feat Power.
As for it needing to be nerfed, maybe. But I wouldn't, until I see how often it comes into play. The target will still typically need 2 healing surges to heal up fully, and if the target is that badly injured, the odds are that a few of his healing surges have already been triggered during the encounter. So shaving off the need for 1 surge is actually more helpful to the DM, so the party can keep going. I don't mind it, even if it is on the high end of the feat power curve.