I thought the base game had some great ideas but the execution left a little to be desired (such as just imbalance between races) and the turn limit made it feel like less of an 'epic' feel to the whole battle.
There is no imbalance between the races, just a learning curve.
This is one of those games that comes alive after multiple plays. That said if you don't like the game, getting the experience required may not be easy.
I fell in love with the game from the first play, and I got absolutely hosed by the Humans, it took me around 4 games to get to the point where I got how to play as the Pilgrims, and another 2 to understand the Machines.