It's just a serious commitment to keep up with the build orders on other maps to have any form of success. I haven't played in 3 months now and I already dread playing Seton's again because I am rusty on the build orders and know I will mess up the first couple of games. And that is for only 1 map. Dual gap is just super relaxed because everything is so sheltered and you have time to develop.
Often makes for a boring match though.