>They should be blogging about use cases and customer successes, not benchmarks.

They do, just recently the cases of AskBlue (Location aware recommendations) and Thomson Reuters (Fast & Secure Single-View of Everything)

https://www.arangodb.com/why-arangodb/case-studies/

I am very interested in Graph-Cases and appreciate the support of Neo4J for projects like the Panama- or Paradise Papers that show how connected graphs help to understand former hidden relationships. Graphs are very powerful and a great addition to relational or document approaches.

(full disclosure: I worked for ArangoDB 2 years ago.) And, I've used Neo successfully for a fraud detection PoC recently...