The decisions you have to make affect the entire campaign.
One can before the game and so much adjusting that it is always different play. Light, heavy, with the rebels a help, especially with "nasty" tricks of Ai etc ..
Who like Master of Orion in real time and the feeling of Terminator like (computer won, humanity fights for survival) does not make much wrong.
Right off they go in multiplayer. Since the opponent and sends to "waves" which is always a common fear that the defense holds. The criticisms of lack of matchmaking or technical problems I can not understand. As a game Ai was anyway takes over 5 hours just to a game at a time and rarely needs to make an appointment. Replace IP address via email or chat program and you can join - in the course of a campaign can even - if necessary - new players to join them - or if anyone has any degree of time - can continue playing the game without them.
Also very laudable - the developer pushes regular updates and content according to the extent of the price is simply madness.
From my highest rating.
There is also a demo, try before buy :) to the game.