I can tell the quality of any Gen 5 mon tier list by Cryogonal's placement.
Bottom tiers mean they are probably parroting common opinions. High tiers means they're probably autistic. Only Mid Tier Cryogonal lists are trustworthy.
I say this as a Cryogonal High Tier placer (In my case the autism is having zero taste and thinking 90% of everything is good or better)