Your assuming that this person is retarded enough not to get any defence......you cant really wall in a terran player with cannons. Once you start piling them on they can get 1 seige tank and seige, and waste all yoru crap. In the beginining if you happen to find them very fast and start building shit in there base....if they dont see a pylon forming they should lose. Bottom line, it wont work very well unless its against a newbie.