...
More interesting is the winrate of the Top100 to Top200, because there it starts to really split up. It would be interesting to see the average winratio of all that players, but I give you a direction. If you compare players that have a winratio of 90% or more on the fourth page of leaderboards (Top150-200) for 4vs4, you will see this:
DAK: 11 players wih 90% or more, three of them having 100%
Wehrmacht: 8 players with 90% or more, two of them having 100%
British: 4 players with 90% or more, highest winratio is 93%
US: 3 players with 90% or more, hioghest winratio is 92%
This data may have changed as you read it, but it should be still similar.
This is just a tendency with low number of games overall, but I fear it is part of the dwindling playerbase.
That data are not really helpful in an analysis for many reasons.