That and that I've never actually seen a Mario main admit this or be fine with where he is on the tier list.That's actually a good observation, they all are more or less the same person.
"Why is Mario so low? He was good in Melee / he is better than those around him. It's just that nobody uses him!"
What everyone seems to be missing is that Mario is a terrible, bottom 5 character.
No true Mario main says, "Yeah, he's not that great. He's fine where he is." True Mario mains say, "Mario should be mid-tier because he's truly that good. No one understands this. Let's see Mario move up a tier or two next time! We got thisderp!"
I don't think Mario mains understand that Mario in Brawl is not Mario in Melee, Mario in Super Mario Galaxy, Mario in Super Mario 64 or Mario in any other game Mario is in. As in, every other game in which Mario is actually good at something.