I don't think there's much more to say (also your email address isn't in your profile) - we had a very bad experience with OrientDB and we weren't doing anything out of the ordinary with it. We didn't even really use the graph features much beyond very simple traversals. The consultant that we hired to try and fix the mess was unable to do so, and he recently told me about 2 other companies that had a basically identical experience to us. The thing is just not ready for production, and for small startups making this kind of mistake can be fatal, that's the only reason I'm saying something.