Only her standard kit is balanced, her ultimate is a bit off from being balanced. Right now it just feels dull and has the power of a standard ability with the exception of being on a longer cooldown and longer duration.
It’s only fair we should now expect some official input after tens of thousands of posts over nine megathreads. After all, the forum is for discussing, and right now it just feels like all the people who are taking time to post constructive feedback and suggestions are just talking to themselves.
[Moderator edit - “Megathread 9” is live - please direct your comments here - [Feedback Thread Continued Part II] Mercy Updates - Jan 30, 2018]