I played this game for a few months last year and I am really aching to get back into it. Before I do, I am curious as to which side is the underdog? 

Well, it's the side with the currently lowest morale.

In the current Campaign has the Allies been pushed back from where they normally wont be able to push back. This however has now been prove to not be true.

During the last days has the allies been able to puch back the Axis quite a bit. In other words this Campaign isn't in no way over.

Which sums it up. There are no underdogs. There are only one side with lower morale then the other side, or less well organised (which often mean the same).

Yup, the Allies have fought back insanely and now the map is close to returning to it's starting point.

It's why I love this game. You can't tell where it's going to go and things can change pretty quick.

 Axis are the underdogs. They have to do twice as much with half the equipment. It's always an uphill battle for them. Allied is called "easy mode" for a reason. 

playerbase consists of less than 100 per side, with allied about 30 players for GMT. don't let the devs and fanboys fool you the game is on its way out.