Off topic, I've heard so much controversy about tiers and i'm sure someones said what i'm about to say before however i'm going to anyway.
When choosing your character for competitive play (to earn money at tournaments) it's true you shouldn't even remotely take a glance at the tier list however you should play all the character in brawl in depth and find which one you can do extremely well with, because metaknight is so good lot's of people that don't even know about the tier list will choose him.
It's just like Melee i personally have never played in a tournament or taken the game too seriously, however i naturally decided my characters of choice were Marth, Sheikh ,Peach and Yoshi and that's even before i knew what a tier list was, Most happen to be very high on the list, purely because i played long enough to see how awesome these characters could be in comparison to the other characters. In my opinion you should never aspire to choose a low tier purely to prove a point however if you decide you can cause max punishment with a low tier because you truely believe you play better with it than a high tier by all means do, and i'm sure that applies to many people.
This post goes out to the person that came up with the comment "tiers are for queers"