To get past this, put the paper down for 3 or 4 days after you've written it. THEN come back and edit it. My best papers were completed and edited a week before they were due. If you write a paper at the last minute, it will look that way. Editing is polish, and you can't have too much of that.
Most people develop writer's block at some point.
To combat that, I usually go through the exercise of outlining the paper and then picking something that I am really passionate about and writing that piece. When that is done, I pick the next juiciest piece and write that. By then, I am usually over my writer's block. While you don't want to call the reader by name, you do want to write to your reader. Use verbiage that you would use in normal life.