Let me address these individually.
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Healing nerf: while not drastic, this is still a questionable nerf. Mercy cannot do (significant) damage, heal multiple heroes at once, or at range unless in Valk. Her core value is mobility + healing consistency. Not to mention-- I don’t think that this would make other healers better-- she’d still be most picked, just poorer on heals. In addition, her current heals match out Winston’s damage, which could introduce a Winston off-pick meta due to being able to chip down heroes that are being healed.
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Cooldown nerf: I don’t agree with this. It’s not economical. It encourages hiding and staying out of teamfights in order to maximize cooldown efficiency-- which the point of the rework being making Mercy more engaged in the teamfight.
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Blaster buff: I love the gun, and I’m sure you do too. It’s extremely satisfying. HOWEVER-- we need to keep in mind that it has no falloff, and a significant 20 damage per shot with 5 shots per second. For comparison, Soldier gets 19 damage per shot with 9 shots per second at optimal range. Now, it’s a little weird here because Soldier’s gun is better, period, but that would put Mercy doing a little over half the same damage as Soldier. It’s still not scary until you look at it in close range-- which is where Mercy will meet most of her flankers. As it stands, I think the gun is very well balanced for what it’s meant to be.
Ultimately, I hate to say it-- but rez is the best ‘utility’ in the game and will never be contested unless we introduce another rez hero or rework it into a preemptive ability. That’s where the healer subcat’s problem stands.