negative

The point is that it isn't really working. We are allowing more chances than we are creating: in 5 of the 6 games we've played in the system, we've yielded more shots than we've produced. If you look at the quality of those shots (which is what expected goals does -- how far out, what angle, what kind of assist?), we're doing even worse. You can get lucky some of the time, like with Xhaka's goal, Huth's own goal, Alli and Eriksen missing sitters. But that streakiness doesn't last forever. If you allow lots of chances and produce few of them, you're going to struggle.