Collections are useless without a commentary on each entry
Collections should allow or even enforce a commentary on each game you add to it, i.e. why you listed this game and why you think it's interesting. Kind of like gogmixes on GOG.com, really. As it is they are just lists, and all you know about them is that someone or some group of people think they're interesting... and maybe that they belong to a theme if the collection is thematic. This needs to improve fast if the community aspect of Greenlight is to be useful at all.