The top player on this map has an unfair advantage over the bottom two players. This was inspired by Unfair advantage from Kane's Wrath.
Player 1 - You MUST be an allied faction or else you will be disadvantaged. When you start you will see the choke point with two silos so you can build defences there (Feel free to sell them once defences are built). Move up to find your MCV and use the engineers to take the two buildings. Also on the left you will find your dock with another silo to build, make sure to defend it with troops.
Player 2 and 3 - Work together (although you don't have to) and coordinate to take out player 1. I found that using navy and air units work best.