Someone should be fired for how they "nerf" and buff things. Nerfing the already underpowered classes instead of buffing what is key.
Changing Dianas skin art to something no one who bought her appreciates really. Now she doesn't even look like a valkyrie, just some screwed up sailor moon reject carrying a sword. Better put a refund option for her skin in store then. Let alone I don't see how she compares to Leona who has a "valk" skin with a helm, yet Diana doesn't. ( Might be time to work on the champs that really need some rework in their art I can name a good one. Kayle and Leona are 2 good examples. )
If the reason you altered Diana's old skin was because of the new upcoming champ, then you guys might need to figure things out in a more orderly fashion. Diana was planned first, designed first, and released first. This means her looks have priority over any upcoming champs down the road. The new champ should be redesigned, not sit there and cause a prior champ to become a conflicted downgraded figure.
Teemos poison seems to never get fixed properly, might be time you guys figured out how to implement things right after the first 5x or fire and hire someone who can.