Won 8 of my last 9 3v3s going 3gate stargate, building a couple of voids and holding whatever push comes, expanding, and then pumping carriers off of 3 stargates, chronoboosting to +3 and running over the enemy with chargelots and carriers (well... mostly carriers) that just pulverize everything. I carried my team every single game (no pun intended).
And the game I lost I failed against a 6 pool hard - scouted it, walled off with a forge and got cannons but they were a bit late. I had plenty of time but forgot to build a second pylon near my ramp as the lings were destroying my only one that was part of wall, allowing them to break through and kill a bunch of my probes, killing my economy.