Her ability to evade was absolutely strong and made it hard for her to be pressured that wasn’t a Widow or Hanzo, which severely hampered dive’s strength. Widow essentially became what felt like an untouchable character because of this. Widow was also enabled by the addition of Brigitte, which provided, burst and cover for her to perform. However, the potentially biggest enabler of Widow was the Mercy nerfs on her res. Res made Widow’s kills and picks null with instant res and short cool down.
I think her grappling hook being 10 seconds makes sense, but may be hasty. There are many changes that are on PTR that may already weaken Widow to be more in line.
First is the introduction of Hammond. Hammond is a unique hero because his high mobility doesn’t expose his crit spot, which makes him much harder to kill as a Widow, and also has a protective shield to make him harder to kill as well. He could potentially open up a triple tank dive, in which Widow would be incredible inefficient to handle the pressure and not be able to kill and Hammond’s damage is actually surprisingly high and much more consistent compared to something similar like Orisa’s gun.
Then there are character changes that will certainly make a difference. McCree and Soldier’s minimum damage changes will actually make it possible and easier for a McCree and Soldier to skirmish and kill a Widow, especially if they get the first shot. Brigitte being nerfed would make her less threatening against dive. Also Lucio and Ana, will have better burst, which would mitigate Widow way better as well.