"1000 words a day may make you feel like a writer, but a 1000 words of crap just makes you a crap one. Writing isn't just about producing words – it's about creating stories, developing characters, imagining worlds. The words that reveal all that are just the icing on the cake. Prose, no matter how lovely, is just prose – without character and narrative to drive it, people will tire by paragraph 2."
From James Killick's blog. More good advice is here.