I don't track many metrics cause I don't need to.
One of the most important for me is the DD Recovery ratio (currently at approx. 1 month).
I don't size based on how much I can win, but on how much I can lose.
Having said that, most of wannabe profitable traders want to win all the time, and they want to win big and get rich fast. I don't have statistics on that, it's just my perception.
My take is that the first goal of any new trader should be to avoid losing. I'm not referring to losing a day here and there, but month after month.
Once that goal is achieved, or while it's on its way, then the next step should be to begin to make money, not that 1M$ in the first year (I'm won't give any name here!!

). The thing is (IMO), the faster you want to make money, the more you need to risk. And at the end, most of traders trying that just blow-up. Yes, we can get rich with trading, but usually, once profitable, it will take time. Not days, not months, not 1 or 2 years. There ain't such thing as a free lunch. But I guess there are exceptions to everything.
60% if winning days might not seem like very good, but if you do the math, and take the hypothesis that the average profit of the winning days are better than to the losing days, you'll come up with good results, at least good enough for me to keep going based on the risk involved.
But all this are very subjective and based on personal goals. For a trader who wants to make 100% per month, for him, I'm a shitty trader. I don't do that and it isn't my goal.
And about my 'EDGE' here it is:
I go long when the market is going up, I go short when the market is going down. I'll just go with the flow.