"I believe the tactical weight of the away goal has become too important," Arsène Wenger said at a conference in 2008. "Teams get a 0-0 draw at home and they're happy. Instead of having a positive effect it has been pushed too far tactically in the modern game. It has the opposite effect than it was supposed to have at the start. It favours defending well when you play at home."
If that is the Jonathan Wilson article on the subject, he does a good job explaining why it was a good idea in the past and why it isn't now