At a minimum...
I'd reccomend using it for personal research, but if you're going to publish or submit something you'd probably be better finding a more traditional source, no matter how accurate it gets.
Unless they start running it like a open source program, lock down a stable release every year or so and archive it, Changes stay on the development branch until a good level of quality and neutrallity is reached, then send it to a production release. Distribute on DVD or CD.
Until then, with everyone being able to edit, and no one's names attached and most of the material uncited even if it was the most accurate resource out their it still would be a tough one to use as a source for any serious paper.