That roadhog buff is pretty close to what I expected. A little stronger, actually.
I think it's fine. People complaining want Roadhog to go back to being a one-shot wonder for some reason, and by dropping his damage somewhat, he's no longer great at 1v1ing everything when hook's off CD. He can usually get a kill, but it's not guaranteed. That's fine. This buff means he's a HELL of a lot more resilient, and his Take a Breather isn't free ult charge for the enemy (both because 50% reduction in damage is less ult charge directly, AND he can run away and dodge), so he'll be more capable at roaming (in a tank perspective, on Defense, covering side alleys and the like). The hook remains just as effective as always for dunking people into pits, which I think is overlooked. It has some major advantages over things like boops; the person drops EXACTLY where you want them, and they get zero horizontal mobility (important if it's Hanzo/Lucio, since you can drop them far enough out they can't grab the wall). It also works on dashing D.vas, if you time it right; boop just bounces off. The bonus with D.va is, since she's already used boost, it's on CD, so it's a guaranteed kill.
Look at hook more as battlefield control and utility and not a one-shot tool, and these changes look pretty darned good.