Yea honestly... reading these patch notes was sort of disgusting.
I don't feel like Lux is weak right now at all. Even if she needs buffs, she needs a nerf to her ultimate first. It is not healthy gameplay that a Lux with farm who is even or only slightly ahead can 100-0 most squishies if she manages to land her Q. And her ult is always up for it. And now her ult will always be up for it even moreso. She could use buffs that make her stronger overall, while requiring her to use her passive-enhanced auto attack as part of her combo to get the 100-0. i.e. reduce the burst part of her ultimate, but either increase her auto attack range, increase her base attack speed, or give her some other sort of bonus to supplement throwing out that auto.
Katarina's change is actually pretty good outside of that 15sec ultimate cooldown at rank 3. Her ult's cooldown didn't scale linearly before, why should it scale linearly now? 135/75/35 would have been a lot more reasonable. Heck, 120/70/35 would work.
Otherwise:
I like the J4 change.
I don't think Alistar or Jinx needed buffs, but they don't hurt.
I don't think Kassadin or Lissandra needed buffs, and those are going to wreck balance a bit too.
I don't know if Talon needed nerfs, but he definitely doesn't need buffs so I disagree there. He's at a 52.25% win rate in plat+ ranked.
AND FINALLY
The Gnar buff and Volibear buff are both so pathetically small compared to what they need, when meanwhile Lux/Alistar/Jinx/Kass/Liss are all seeing much bigger buffs despite having been strong much more recently AND being in a much stronger spot right now. I can't understand why Gnar and Volibear are barely getting any love at all, while these other champions are seeing such big improvements.