This mini-review provides an overview of the recent developments in the field of angle-resolved photoelectron spectroscopy of neutral weakly-bound molecular aggregates with sizes that range from the gas phase monomer into the lower nanometre regime. A summary of the recent first size-dependent studies of neutral single-component and solute/solvent nano-clusters in the valence-shell region is provided. The challenges in determining independent information on the particle size as well as accurate angular-dependent information are highlighted. Examples of potential artefacts that falsify the true photoelectron angular distribution are discussed.