We spent a lot of time and money trying to get OrientDB working and we ran into so many problems that it was impossible for us to continue with it. It is buggy beyond belief, distributed mode is deeply flawed, transactions are not transactional, it's super easy to hang the database and the explain keyword straight up lies, the backup strategy is non-existent, the documentation incredibly poor and riddled with typos and outright mistakes. When we finally thought we'd got over these issues, we imported our data and the system ground to a halt, just weeks before a major product launch.
Luckily we were able to move to Postgres pretty quickly, but choosing OrientDB nearly sank the company, choosing it was an inaffordable mistake.
Also, look at this list of issues closed as "invalid/wontfix", it seems like you're a lot keener to close issues than to actually fix them - https://github.com/orientechnologies/orientdb/issues?utf8=%E...