It is customary to describe complexity theory as new, exciting, and interdisciplinary. Its advocates suggest that it offers a new way of seeing the world, a scientific paradigm to replace ‘reductionism’, a way for many academic disciplines to use the same language to explain key processes, and the potential for an impressively broad and rich empirical base. Robert Geyer and I explore these themes in the introduction and conclusion to our edited Handbook on Complexity and Public Policy. In this short discussion, I present a more critical discussion of these high expectations, examining how they translate into something new for political and policy science, and asking: what does complexity theory offer policy studies? I suggest that its focus on greater interdisciplinarity is potentially misleading, that its theoretical appeal may be more about conceptual consolidation than novelty, and that it may take some time to demonstrate its empirical value in relation to more established theories. We can use this discussion to draw parallels between the study of policy and legal processes.