There's a lot of debate about different factions and balancing. I suggest that in true beta spirit we all start playing the side(s) that we hate the most. Hate gunships? Play UEF. Hate Monkeylords, play Cyrbran. Hate Aeon artillery, play it. Etc, etc.
I know that many of you have done this, but why not do it more? I think that there are some balance issues too, but one thing will show it clearly, and that is more gameplay. As you play the other two sides more and more you may find that you just win more if you play them. Keep experimenting with the factions until you figure out which one wins you more games. Any big balance issues will result in one side gettin' played much more frequently, and who knows, you may be one of the converts.
There are already some trends along these lines as I'm sure people will point out, but there are also people who do not believe that there are any such trends. It is then up to the people who believe in the imbalance to cream the ones that don't, and it is up to the people who say there is no problem to try the other side.