Agreed with lescor and most other posters.
If you're going to financially rate a trader you need a mix of measures.
- how much can be made per day is key (lack of trading opportunities, thin markets etc can make a good system go bad)
- is the system reasonable using some measure like profit factor or expectancy (better) to know that its picking a good amount of money out for the amount risked. But a pf of 5 isnt necessarily better than 2 ... as illustrated by lescor.
- smoothness - do you want almost every day to be a winner, almost every week to be a winner or almost every quarter to be a winner (long term daily chart trading).
But like trading there are no absolutes ... you have to get the right mix for your capabilities, your comfort levels, and the way you want to trade.