if you are around the middle of the tier list down to above the bottom 4 tier, you'll likely have a lot of evens and slight (dis)advantages, with a handful of great matchups (probably falcon/ganondorf/someone else maybe) and poo matchups (mk/dedede/marth/falco/snake being most common).
i've noticed this with mario, pt, and sonic now. basically, matchups rarely matter for you, it's mostly dependent on player skill. with the exceptions of your character's top 3 worst matchups in the top 10 of the cast. imo tier placement is then mainly just dependent on how you do against the best characters in the game.