> Imagine taking the whole Web, removing spam, duplicates, bad explanations
Uh huh. Now imagine the collective amount of work this would require above and beyond the already overwhelmed number of volunteer staff at Wikipedia. Curation is ALWAYS the bugbear of these kinds of ambitious projects.
Interactivity aside, it sounds like you want the Encyclopedia Brittanica.
What made it so incredible for its time was the staggeringly impressive roster of authors behind the articles. In older editions, you could find the entry on magic written by Harry Houdini, the physics section definitively penned by Einstein himself, etc.