I say it again. Allies suffer under the low player population. That's main reason for the loss/win rates.
When I play higher team games, the axis ranks are homogeneous while the allies have ranks that are highly mixed.
Of course you roflstomp teams that consists mainly of players that are x000 ranks lower than you. While you and your team mates have a similiar rank.
If however you face fixed allies teams, things become different and balanced.
Says the guy who is rank 12 with OKW in 3v3 random and mostly play as Axis.
It would be interesting to know the numbers for the top 200 AT but this is what I managed to get from the top 25 teams.
Top 25 Axis 4v4
AT:
http://www.coh2.org/ladders/index/0/7/0
Average win ratio: .963
Average games played: 41.12
Top 25 Allies 4v4
AT:
http://www.coh2.org/ladders/index/1/7/0
Average win ratio: .892
Average games played: 48.12
What this basically suggests is that Allies are much more difficult to play than Axis, especially if you are in a random team. Relic admitted that in their patch notes and it all comes down to that Axis have less amount but more powerful units while the Allies are supposed to have more units overall. Of course it is easier to control a few but powerful units rather than microing more but less powerful units.