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I don't think you can quantify what 50% skill means.

I was watching a baseball tournament (forgot which one), the series was tied 2-2, and the following statistic was placed on screen:

The winner of game 5 of a seven game series tied at 2-2 wins the tournament 76% of the time.

The announcer's seemed stunned about this fact. They seemed not to understand that if they flipped two coins instead of playing the last two games, the winner of game 5 would win 75% of the time.

If you start looking at statistics, you could probably convince somebody that baseball was a game of chance if you used the 50% chance criteria.

But if you want quantification, how about this:

Given the chance to play either a skillful opponent or a non-skillful opponent, I will choose the non-skillful opponent 100% of the time.