since they banned him recently, I went to go check out the most recent matchup list
http://super-smash-bros.wikia.com/wiki/Character_matchup_%28SSBB%29
compare now to the Third Strike tier list
http://www.eventhubs.com/guides/2007/dec/18/tiers-character-rankings-street-fighter-3-third-strike/
that is the best comparison because Chun and Yun are more broken across the board and no one in the 3S community has even suggested banning them. according to the "Meta Knight Officially Banned!" topic on Smashboards, 75% of their community was in favor of the ban in the most recent poll.
Brawl community lookin kinda scrubby, just sayin!