In any case, self-evaluations shouldn't be regarded as substitutes for thoughtful responses from teachers and peers.
A good self-evaluation is neither a defense nor an apology.
Rather, it's a way of becoming more aware of what you go through when you write and of what troubles (if any) that you regularly run into.
While I have radically improved as a writer throughout the If I stutter whatsoever or blatantly recognize a fault in my piece, I change it immediately.
I also wish I had less work outside of the course (such as schoolwork, housework, social events, etc.) so I could have spent more time on my pieces for it.