General:
* Hack: This is a common term for a writer who produces low-quality work, often considered to be formulaic and unoriginal.
* Scribbler: This term suggests a writer who produces work quickly and without much care for quality.
* Mediocre writer: This is a more neutral term, simply indicating that the writer's work is average or below average.
More Negative:
* Pretentious writer: This term implies that the writer tries to be more sophisticated or intellectual than they actually are.
* Dilettante: This term suggests a writer who dabbles in writing without true dedication or talent.
* Charlatan: This term is harsher, implying a writer who deceives readers with their work, often for personal gain.
More Specific:
* Ghostwriter: This term refers to a writer who creates work for another person, often credited to the other person. While not necessarily implying inferior work, it can be used in a negative context if the ghostwriter is poorly paid or exploited.
* Plagiarist: This term refers to a writer who steals the work of others and presents it as their own. This is a serious ethical violation and can lead to severe consequences.
Ultimately, the best word to use will depend on the specific context and the level of negativity you want to convey.