APA and MLA are styles used in academic writing. These styles show a level of professionalism and intent of the student. When the styles are not adhered to correctly or the composition/content of an essay or journal article is both sloppy in format and grammar, the writer is seen as unprofessional.
Better ways to approach your writing:
Go to the writing center at your institution for a pair of fresh eyes to comb through your essay.
Get a family member, friend or spouse to read the essay out loud back to you.
If you have the luxury of time, set the essay aside and re-visit it again in two days.