Because they are paid by the number of words they write rather than by how good they write, they may be redundant in their writings and whatnot. Their prose may appear as if they intentionally sprinkled it with overly lengthy explanations and crude language. It is possible for work by hack writers to seem inconsistent, but this is usually the fault of the crappy brains many readers posses. Some may even seem completely unknowledgable on the subject they are writing, often appearing to not even have a grasp of basic facts, but those kind of claims are ludacris because hack writers are masters of the written word which is why they are so prolific and varied in their work.