Watching Otz's 'Rating Perks' Video Made Me Realize Something...
A lot of survivors complain, currently, about killers only running 1 of about 6-7 different perks.
While I don't agree with Otz on everything (only basically everything killer related ^_^ ), he is one of the best killers out there, and he plays basically every killer and tries basically every perk combination.
The vast, vast majority of killer perks are either 'mediocre' or 'terrible'. This is usually either a result of them being so niche you may never see them actually activate, or so weak that the survivors might not even realize that it did.
There are 10 or so others that are decent, but situational/have a huge trade-off/have a massively long cooldown, and perhaps 6 that are 'good' or 'excellent' for the majority of killers and games.
Could it be that maybe the problem isn't a handful of perks being too strong - but the vast majority simply not being good enough?
EDIT: To anyone saying 'well, this is true of both sides' - I challenge you to go through survivor perks and killer perks, note how many on either side are universally good (even where surpassed by better perks) and how many are universally bad, to the extent where they are an outright nerf over an empty slot and compare the two.