Tier Lists...
Credibity depends on what they are based on and other stuff.
At least what I see on EvenHub for example sometimes just gives me a little wtf (Link in Top 15 for example).
Since basically everyone can vote a lot of random casual opinions will be reflected in the list.
Looking at competetive results is better here, but...
Meta isn't fix and developments will always happen with Characters, like discovering a new Strat, Idea for handling Match-Ups, etc.
And sometimes certain chars will get popular due to like 1 or 2 guys being really good with them, getting multiple top spots in tournaments, creating more followers, more tops, higher place in the tier list, etc.
And some other Chars may just sleep there waiting for someone worthy to pick them up.
Given time it will become clearer though, but that also depends on the patches.
Since it's probably the best balanced Smash out right now (dunno vs. Project M, no experience there) the Tiers will become harder to set though.
Good Tier List should be respected, but not taken for granted.