I've been lucky in my life ... with editors that is. As an inexperienced writer I needed help, professional help. Editors have cleaned up my clumsily written prose, checked my tendency to misplace adjectives, and caught my slipping povs (point of view). The editor's job is to prevent poorly written sentences from ever offending a reader, polish paragraphs, pick up spelling errors, and prevent grammatical embarrassments.
I love editors, their job is to catch my mistakes, offer suggestions, and make me look better. Remember an editor knows their readership. A good editor is a writer's best friend.
(Disclaimer: If you find any of the above mentioned mistakes, please remember I'm working without my best writing buddy.)