People like Tolkien, Victor Hugo and Stephen King, (even Rowling in the later Harry Potter books) have all been accused of "Over-Writing"; i.e. taking everything they write into 800 - 1200 page books that never end. I am myself a terrible over-writer who would probably take a 2 page story and blow it up into 3000 page trilogy (not that I have but I could).
So I ask you what you think of thick overwritten never-ending novels like Les Misérables, Lord of the Rings and the average Stephen King novel? Is such lengths acceptable or should a writer be allowed to over-write?