I have been 'researching' a bit graph database applications last week, and I am quite impressed what the Neo4j/graphdb ecosystem has to offer.
Mostly I was just researching this technology for use in an application as visual 'entertainment' and for sure nothing analytical.
So last week I have seen countless graphs with circles linking to other circles. I am constantly seeing pros/cons lists of rdbms compared with graphdbs.
What I have not seen in all these demos and blogs something that really justifies the use of graphdb. Something that made me think, yes that is really a good application and that is what I am missing currently. Some data being analysed and reported that would not have been easily extracted from a conventional rdbms.
Why nobody goes that far to compare a data set in postresql and neo4j? So you can show performance, resource use differences under specific conditions.