While Hager said his side were better defensively, the performance wouldn't have given him much confidence ahead of their first Champions Trophy match against Argentina in Rosario on Sunday.
He told the Herald on Sunday before the Great Britain game that he felt other nations had moved ahead of New Zealand, who are ranked sixth in the world.
"We had a great year [in 2011] but at the moment it feels like other teams have moved on and we have plateaued a bit," Hager said. "It has certainly been a huge wake-up call and, to their credit, the girls have been quite harsh on themselves. They are hurting, too."
He added: "There is a lack of cohesion and understanding. We are scoring goals which is a plus but defensively we have capitulated in both second halves. It is disappointing and well below the standards we have set for ourselves."
Mitigating factors included rustiness and a rotation of players in the opening games but Hager wouldn't offer excuses.
"Plain and simple, we've been poor on defence: poor basic skills, inability to tackle and lack of patience which has led to diving in and conceding needless penalty corners."