Ball main here.
I don’t dislike this particular nerf.
What is really bad is that the hero has been nerfed multiple times (5 times last year and now this) without a decent compensation buff besides instant shields cast (also nerfing shields HP), his knockback is 
, Lucio, Pharah, Brig have better boops than Ball, and his spawn rollouts are non existent.
This change was not needed at the moment (I could have seen it happen in OW2 since supposedly they’re removing CC for non tank heroes but Ana magically keeps her sleep) and they should revert grapple cooldown on respawn to at least let the hero “touch the point” which was part of his niche, now totally non existent, because low skilled players can’t hit a giant ball with one of the multiple +10 CC heroes to stun or screw up ball’s movement, a literal giant ball hitbox running on a predictable circle.
Also, there’s no visual cue or resource meter to how much time the grapple can be active, which is counter intuitive.
What really annoys most tank players complaining about this patch is that they pushed through completely unnecessary damage buffs to DPS heroes that were already strong, while other heroes are like Reaper and tanks will still explode.
Rein’s buff will do more damage to the tanking role in general because, duh, more damage to instantly explode, instead of a healthy buff, which could’ve easily been done by buffing shatter stun duration to 3 seconds.
So ball has been nerfed due to “stalling”, but then, where’s nerfs to heroes like Mei, Dva, Lucio for stalling? None, because they’re not needed at all.
And for getting out of spawn faster? Why does Lucio keep his speedboost whithout a cooldown, or Tracer blinks, and so on? It’s just completely silly.