You see champs posted on sites like U.GG like Amumu, and Lilia being S tier junglers but then see Belveth being B tier.
Sites like U.GG do skew the perception upon seeing stuff like this and while there are many other sites that would do this... Theres no real concrete way to know because at times it boils down to three things: Champ knowledge and how accessible their learning curve is, Team cohesion, and macro knowledge.
But what tends to skew skill perception is if people choose X champ and then they don't really know how to play another champ if they're a OTP Jungler...
Does this help at all?
I mean heck.. Even for Supports, according to U.gg that Milio, Sona and Zilean are considered B tier compared to Pyke, Senna, and a few others... But it also depends on which rank you're looking at them on U.gg as well... Because lower Elos only gravitate towards whats the best play and get silohed into this thought process to not really explore other champs...