I doubt the number of errors is significantly different. The horrible mistakes I've had to correct on WP suggest otherwise, even if that's just anecdotal.
Sometimes, less is more. I don't think we really need trivia from the film set of the Infinity War or whatever. Selecting the most relevant material is an art in itself. A scholarly monograph might be used to dump info; an encyclopedia has to make sense of it for the layman.
Up to date, mostly yes (unless the editors get their info from outdated sources, which does happen), and accessible, definitely.