Mercy just feels a bit over-saturated as of right now. However, I can agree with most of the changes she's getting anyway; the rez not resetting is a good move in my opinion. I've seen a lot of Mercys ulting just so they can rez their team even when they're not in a team fight or anything.
I wholly agree with Katzuvo! She, by far, outweighs the other healers by way too much. Not saying that this is a problem, as she (should be) is focused on mostly healing and not doing much damage, but her kit is over-detailed and is kinda OP most of the time. Since Tracer is pretty much the squishiest hero in the game, I can't tell you how many times I've been targeted and murdered by an ulting Mercy. :,) As a short to mid-range dps, you'd think that I could take her out pretty quick, but 93% of the time I somehow end up dead.
Same goes for when I play D.Va; now that she can fire her fusion cannons while flying (which I love love loVE by the way) dealing damage to a Mercy, ulting or not, is pretty easy. But honestly?? D.Va has this eNORMOUS headshot hitbox in her mech, and if I'm at about 200-300 health in that thing, valk Mercy can pop me out of it pretty quick.