Ok, this is by far THE best 3v3 strategy ever! I call it the "RESIGN RUSH," and I have NEVER lost a game with it! Now just hear me out, it's not what you think, you don't all resign and it's not a rush, but I'm not very creative with names so that's what I picked. Basically, it runs like this:
You need at least 1 Forge, the other two can be any leader. The Forge player just builds 5 HSPs and feeds the other two the whole time. Meanwhile, any covenant player goes for 2 blessed WHs, temple, sheild generator, hall, factory, summit, in that order, and any UNSC player goes 2 HSPs, 4 reactors, barracks, vehicle depot, and summit.
Here's the important part: After 8-10 minutes or so, the Forge player, and ONLY the Forge player resigns! And you're all like "wtfZ?" but look, after the Forge player resigns, he presses 'A' to look at the game stats. Then, he looks at what the enemy is researching/producing, and tells his teammates. Then since the other teammates have every unit producing building, they can make whatever they need to counter what the enemy is doing, so they start mass producing and steamroll the enemies!
So that's how the resign rush goes, any comments/criticisms would be awesome.
I made a flow-chart for those of us who struggle with English as a first language:
http://img202.imageshack.us/img202/2711/dumbass.png
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2v2 with ChainsOfAnarchy: 21-1