This thread is filled with delusional players who main characters with broken gimmicks who are trying to justify that their characters are 'good' design.
Characters that are well designed have obvious strengths and weaknesses, and with no abuseable, gimmicky, mechanics.
Well designed characters that come to mind are Wario (poor recovery), Wolf (spacie), Charizard (comboable, no projectile), Metaknight (crouch cancel everything, light), Ike (poor recovery) and Roy (fast faller, mediocre recovery, no projectile).
Poorly designed characters (not necessarily broken as a whole, but has poorly designed aspects). Squirtle (many characters have 0 options against side b), Diddy (safe/free dash attack), Mewtwo (everything, but the float nair (plus frames on shield!!!) on shield is fairly significant), Ivysaur (free recovery, bair is extremely polarizing for certain match ups, especially as an edgeguard), Snake (upb oos being able to cancel into an aerial is silly, and the whole jab reset -> tranq -> sticky -> uthrow -> c4 combo is too brain dead and devastating to be a missed tech punish), and Lucas (free recovery, kills off throws, the list goes on).
Consider the top characters in Melee: Fox, Falco, Marth, Sheik, Jiggs, and Peach. Although relatively unchanged, relative to the rest of the PM cast they're all considerably weaker than some of the characters in PM. That says a lot about the design of some of PM's cast.