WHAT DOES JOKER MEAN?

Peter Bradshaw on the Guardian gave Folie à Deux 3 out of 5. He praised the opening, the supporting Solid along with the "actual spark" in the first come across concerning The 2 protagonists, but wrote that "The full movie eventually turns out to become oppressively, claustrophobically and repetitively becalmed in that oddly unreal Gotham-universe