Also, less is not more. Text needs anecdotes, examples, and illustrations to enliven the writing. Not convincing or unclear. Poorly developed thesis. The text is full of faulty logic or incomplete transitions and explanations.
Text needs compelling examples to back up concepts.
Go here to see some things a writer can do to avoid turning their reader off. Or for a quick glance at grammar don'ts, see gooder grammar or how to write more better. For a creative writing point of view, see The Seven Deadly Sins a writer can commit from the Litpoia literary agent website.