Rubrics are the easiest way I have ever found to grade papers. It takes a long time to read all the papers turned in each week, and even longer to edit and provide feedback.
Rubrics also help me to grade my ELL, 504, and Special Ed students appropriately, especially since there is no specific right or wrong answer.
This is a collection of rubrics I have used over the years with students of all ages. They are primarily Word files so you can adapt and edit as necessary.