I disagree; I think the weakest part of React is the lack of a true controller mechanism.

Everything is a view, even components that are structural more than visual. You achieve an MVC-like separation by designating some components as being owners of data, but it feels awkward.

Facebook's Flux looks like it may be a good solution, but I haven't tried it out yet. At any rate it is more about data flow than high-level application orchestration.