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Writing. "Bad writer" means bad characters, bad plot, bad dialogue. Everything depends on the writer. You have to have the idea first. Writers are undervalued and exploited and so writing is just viewed as a sort of "mill" or "mine." As a writer, you know that the director and lead actors will get the credit. You know that your script will be circulated, plagiarized, and mangled before it hits the screen -- and that's if you're lucky enough to have people reading your work.
There is still good writing out there that is appearing on screen. What gets me is the amazing difference in the quality of writing and that so much of it is just bad. We're in an algorithmic phase where statistical data is being used cobble together elements and it shows. Also, there are a lot of hack writers out there relying on beat sheets as their guide. Then, there is a moralizing in the younger voices who make so many stories into little "Passion Plays" - flat perfected melodramas with uncomplicated heroes who have nothing the learn (except maybe to be reminded how wonderful they are) and uncomplicated villains. In each case, the writing is secondary. In the case the algorithmic overlord, what matters is cobbling together the required features, even if they don't really fit. In the case of the hack writer, the creative process is a formula--the hack is also a strip-miner as much as the producer. They're just throwing stuff at the wall. The sermonizing writer is more concerned with orthodoxy than quality. The moral truth comes first, if that makes the product a little bland, who cares? We're changing the world!