Moo claims that Wright has made the background of the New Testament the foreground and the foreground the background.
He means this negatively, but there is a positive aspect to this (at least the first part). Namely that Wright draws to our attention aspects of Paul's thinking that have largely been downplayed or neglected. I think that is a large part of Wright's appeal for me.
To use a musical analogy, like Wright is so fond of doing: imagine a sonata whose first and final movements are well known but whose slow movement is rarely listened to. By my attention being pointed to the slow movement, I not only develop a new appreciation of that movement but for the entire piece as a whole and I see a unity I was otherwise blind to.