Dec. 2009? 3 posts? No evidence for or against?
...people need to stop doing this.
Unfortunately, with no poll up, this is the only place where people who don't want to spend time writing an essay about the subject can add their name to the tally for or against.
Also, the miscommunication above here is due to low tiers' vs high tiers' matchup terminologies. When Link mains say "the Link vs Marth matchup is pretty even", we understand it to mean "it's 60-40 Marth." When Link mains say "Link vs Snake is even," we mean it's 55:45 Snake. If we say "Link vs Captain Falcon is pretty good for us", we mean it's 50:50.
The understanding is that, if you play as a bottom tier, the average matchup you deal with is about 60-40, so that when you ask the question "how good is that Link?", you actually are asking how good of players that Link can beat when he's at his usual 60-40 disadvantage, not how well he plays in the rare 50-50. Unfortunately, this also means that we tend to apply this same sort of logic when we look at top tier matchups.
Low tiers aren't the only people who fall into this trap. For MK, for example, the REVERSE logic applies; when a character is like 55:45 in MK's favor, some MK mains fall into the trap of calling that "possibly in the opponent's favor" because they're used to having 65-35 matchups.