How do I know how many wins or loses my lawyer has done? How many are the average win lose ratio?
Criminal Defense Attorney
there is no answer to your question, as law is not baseball and attorneys do not have an earned run average or any such statistics.
Any attorney practicing any length of time in a given field will generally be sufficiently competent to handle any such matter within that field.
You may check with the bar association, or AVVO, for any reports of misconduct and perhaps at best ask a few other attorneys in the general community