Earlier quoted context omitted.
Tekken is easy to win for a button masher. Once in a while, a button masher will beat a top-tier opponent. In SF/MK, a button masher has zero chance of winning against a top tier opponent. The skill curve is much steeper.
What are you talking about? Tekken is basically Knowledge Check: The Game, and the very first level of knowledge check (df+1) is going to be completely unbeatable for someone that doesn't know how to respond. In Street Fighter, you can guess right and jump over a fireball 6 times in a row and win.
It does not apply to top-players, obviously, but for players in the middle of the distribution curve Tekken can be hell.