I found this as a blog on AiB and thought it was good.
My comparison of Meta Knight to Shin Akuma.
posted to the public at 8:33 PM on Sunday Apr 12, 2009
What if Shin Akuma had been added to the roster of characters in SF IV... if you know SF stuff, you'd know that Shin Akuma would MOST LIKEY be SSS tier over Sagat who is ALONE at S+. What if Shin Akuma could EX special 4 air hadokens, multiply everything else by X2 and had as much HP as Ryu or Ken.
Analogy time. I'm adding Shin Akuma -- not in SF IV, but was broken in Alpha 3 -- to the SF IV tier list. Shin Akuma would most likely be in the same place analogously as Meta Knight is on the Brawl list.
Snake : Sagat as Meta Knight : Shin Akuma
SSS Tier: Shin Akuma (NOT REAL)
S+ Tier: Sagat
S Tier: Boxer, Blanka, Zangief, Ryu, Seth
A Tier: Chun, Dictator, Rufus, Akuma, Ken, Viper, Honda, Dhalsim
B Tier: Guile, Gouken, Abel, Fuerte, Fei Long
C Tier: Vega, Cammy, Gen, Rose, Dan, Sakura
Now look at the smash wiki Brawl tier list.
http://super-smash-bros.wikia.com/wiki/Tier_list
My philosophy is that "A character -- Meta Knight -- that is rated ALONE significantly higher than another character -- Snake-- WHO IS ALREADY RATED IN A CLASS OF HIS OWN ABOVE ALL.... needs to get banned. Meta Knight shouldn't exist, just like Shin Akuma doesn't exist in SF IV.
Why use Marth when you can use Meta? Why use Akuma when you could use Shin Akuma? People that main ANY CHARACTER that 2nd Meta Knight will eventually drop their main for Meta if they play to win.