Void had some very good Mewtwo experience, playing (and beating) Rich Brown multiple times, and having a mewtwo of his own. But he still got 3-0'd by abadango, at one point not even being able to take a stock off. Someone forcing Void to switch to a secondary, widely considered the best solo Sheik main, and still losing convincingly anyway, just really made a statement.
And people keep bringing up match up experience like abadango would have never won if people knew the match up. Not only did abadango win, he won in a convincing enough fashion that it's reasonable to assume that there is more to it than his opponents simply not knowing the match up. If MU ignorance can carry you through a major, Mr. Game and Watch and Pac Man would be running amok.
And Mewtwo has had some very impressive showings at the regional level with players such as Blue, Mew^2, Hitaku, Meme, and others over the last 2 - 3 months or so.
But people are STILL giving me heat for saying he's a top 15 character.