I'd say it's absolutely the worst. For about ten seconds it seems like it's a nice higher level abstraction, but then you realize how that abstraction is hiding

I'd say it's absolutely the worst. For about ten seconds it seems like it's a nice higher level abstraction, but then you realize how that abstraction is hiding exactly what you care about: how your data maps to the underlying storage. Making it look like SQL was also a huge mistake because it gives the impression of a certain level of expressivity that it by no means has.