Kaisa and defensive items
When kaisa was being developed, Riot emphasized how she should be a "high risk, high reward" champion that should only work if you're good but people are blind picking her because they know that Kaisa is the opposite of an AD like that, she can basically build every defensive item for a carry and it would be a viable build. ( Zhonya's+ Merc Scim+ Banshees is a legit build on her, Really?)
I may just be butthurt because I face Kai'sas in every game I've played and no matter how well I do in lane, as long as his team can stall long enough for her to get 2 and 1/2 items, she can dumpster everyone in seconds. Which should be my and my team's fault for not ending quickly but she should not be allowed to carry that hard when, if you're decent with her, you can deal as much damage as a twitch with the safety of an ezreal.
Riot, please, at least limit the amount of safety she can build to one item because she may have weaknesses but the advantages she can bring is, certainly, not high risk high reward.