I've been playing with characters that were foreign to me, lately, and here is what I think is the case right now. This is mostly based on what I feel a character's potential is in high competitive play ( metagame, primarily). Tournament results wasn't considerably relevant among those who I naturally think are low: I either don't know how good certain players are, or I don't know enough about what characters were used.
This might not be in my exact order.
Top:
Metaknight
Very high:
Snake
High:
Dedede
Marth
ROB
Squirtle
Lucario
Falco
G&W
Kirby
Pikachu
Higher-of-middle:
Wario
Olimar
Luigi
Ice Climbers
DK
Diddy Kong
Pit
Peach
Wolf
Lower-of-middle:
Toon Link
Shiek
Mario
Ness
Jigglypuff
ZS Samus
Low:
Yoshi
Fox
Charizard
Venusaur
Lucas
Bowser
Zelda
Ike
Bottom:
Link
Ganondorf
Sonic
Samus
Captain Falcon
Middle was hard for me to organize thoroughly, though it is roughly how I view it to be. There isn't an official "Heart-of-middle" tier, but it encompasses the bottom of the higher and the top of the lower middle tiers.
Personal experience leads me to conclude that people I've seen don't play the following characters properly and are the main reason most place them lower: Ness, Shiek, Mario, Luigi, Yoshi, and Bowser.
These are characters I've concluded have low metagame potential compared to their usual tier placing: Fox, Zelda, G&W, Wolf, and Pit.
To discredit most personal biases, characters who I hate the feel of when playing are:
MK, Snake, Dedede, G&W, Wario, Olimar, Pit, Diddy, ZS Samus, Sonic, Zelda, and Wolf.
Characters who I love the feel for are: Mario, Falco, Falcon, Ganondorf, Jigglypuff, Shiek, DK, and Bowser.
The rest I have no possible emotional biases towards.
If possible, I would like to hear arguments against my placement of G&W, Venusaur, Fox, Wolf, Luigi.
Is it safe to assume most will find others not out of reason?