Believe it or not but these rankings are based on imdb and rotten tomatoes. The justice league movie they're talking about (here) isn't relative with what zack snyder released as at 017 and 21 (snyder cut). 

We talking about an older justice league cartoon from 2004, justice league unlimited. Oh and also, young justice (another dc production) is rated at number 6 or 7 on this list. 

Makes me wonder why DC are failing to portray their characters properly at the grandest stage of them all, the cinematic universe's big screen