Why the next patch is going to be bad
Let's see, there are some significant buffs to a lot of the keystone masteries, and yet no nerfs to the champions that will be able to abuse them in order to get way stronger than before. Let's see here:
with the new Warlord's Bloodlust can heal for 25% of the damage he deals and get +30% attack speed. This is completely absurd since he does so much damage so fast that if he heals for 25% it'd be like he'll live forever unless he makes a significant screw up. And Yasuo is one of the least fun champions to play against.
with the new Stormraider's Surge. He's so slow that he just gets cc'd and wrecked endgame and isn't even as useful as he is midgame, huh? Not anymore, with this, he'll likely be able to get around after just a single q and then completely dominate a teamfight. It'll really suck playing against him since if he gets enough stacks, then endgame is just good game. You could have the rest of your team way ahead but he'd probably just wipe them all out anyways if your top laner isn't very good. He probably won't even be OP, but he will be another absolutely horrible champion to play against.
with the new Deathfire Touch. Since he wasn't already damaging or OP enough before, might as well give him even more damage. Even at level 1, one w will be able to wipe out a gargantuanly hugely ridiculous amount of health. And he'll scale ridiculously well with dealing very high damage all game. He's already the highest ranked winrate champion at 55.5%. I know that includes all skill levels but still, he's going to be the ultimate freelo champion next patch if he doesn't get a nerf.
Not only that, but also with so many of the keystones giving you even more damage or more speed in the case of Stormraider's Surge, but pretty much only if you're ahead, then champions will snowball even harder than before, meaning games could likely be over even faster.
Finally, supports are getting a nerf to their best item, in Frost Queen's Claim. Since they weren't already the weakest champions on the map by enough yet, make them even weaker. Great fix Riot.
Now admittedly the next patch is going to fix some things, but I feel these new problems are bigger than the problems that they're actually fixing.