The win-loss ratio is one of the statistics held in the stats tab in Cyanide. Its not a brilliant measure but its as close as we get. It largely ignores draws and only seems to count ranked matches. I'm not sure how it counts crashed games, but they appear to register.
Oddly draws aren't quite worth nothing, so if I'm on 46.1% and next game I get a draw, it goes up slightly to something like 46.2% rather than leaving it unchanged, but I can't figure out the value it attributes. If I'd known it wasn't straight forward I'd have figured it out back when I had 10-20 games played instead of 350!
So for me right now it shows 118-78-140 which I calculate (ignoring draws) as 45.74% yet it shows me 46.73%
Ignoring private league matches I'm at 117-77-133 which calculates to 46.80% so it can't be that either. Similarly MM only games recorded at 109-70-131 doesn't match either.
Taking out 8 crash losses would put me at 118-78-132 and doesn't work either...
In any case, its a reasonably close measure.
Some samples from coaches in CCV just as a way of showing the general calibre of coach on BBT and in CCV:
Creamster 60.7%
jrpeart 58.8%
Etheric 60.8%
maxcarrion 58.0%
Netsmurf 63.0%
Rusty 54.9%
Danton 67.5%
John McGuirk 68.6%
And yourself Narly : 65.08%