What am I supposed to know about this? I've only used an object database for one serious (>100KLOC) project, but it was by far the best part of that system. I always wondered why that architecture never caught on.
The only reason I'm not using an ODBMS on my own projects today is that there's no good open-source one, but that seems like something a company could do something about, and a lousy reason to condemn an entire architecture.