It's apparent the writer hasn't actually read
books in the genres in which she is writing.
The writing is full of grammatical errors.
Has anyone ever read your stuff and thought that English was your second language?
The writing feels wooden.
Vary your sentences. While writing, you should vary your sentences. Before sending a proposal to an agent or editor, read over your manuscript, checking to see if you've varied your sentence structure. Varied sentences make the work more interesting to read.
And...slavishly following rules makes our writing feel wooden, too.
Too much showing.
He went to the car. He opened the door. He sat in the driver's seat. He turned the key in the ignition. The engine roared to life.
I don't care about what happens to the characters.
If the writing is clean and flows well, I still will reject a story if I don't care about the characters.