This map has probably given me more trouble than any of the others. I have played on this map 5 times since its release and have only had one win on it. My usual strategy is to 4 gate or grab a Robo and do some early aggression, but I am quickly finding out that the positioning of the bases and their ramps have made early aggression easily defended against.
The natural expansion is also easily defended and hard to harass as the entrance ramp to the main is so close to the natural ramp so there is no reason to take it early. With a Sentry or two you can easily prevent your opponent from sneaking in. Terran Siege Tanks can easily defend both from the same spot. There is also not much room in the back of each main to hide air units like in Desert Oasis. So a frontal assault and harassment are both easily negated, so how do you defeat your opponent without relying to heavily on either tactic? In most cases your opponent will not try to do some massive attack early on, instead relying on Void Rays, drops, or Banshees to keep you on your toes or catch you unprepared and finish the game early.
As a Protoss, I realized that I too can take that an early expansion and that Colossus cost only slightly less than Carriers but require the same amount of tech structures to create. Why not go Carriers? If you watched Day(9)'s daily on how effective Carriers can be. People didn't realize that each Interceptor does 16 damage (2 shots 8 each). The majority of my opponents went primarily ground assault forces, very little anti air was ever made. With the distances between the bases so far, and an expansion easily defended, there is no reason to skip the initial tech and go straight for Carriers.
This reasoning applies to all races. On this particular map, take that natural early and get some more advanced tech, you will be surprised how fast you can get it and how easily accessible it is.