Last year I watched a movie called Race to Nowhere. It was awesome. And it tackled this exact question. The movie was about more in that it talked about too much pressure in schools across America, not just in HW, but in classwork, getting into college etc. But HW is a prevalent question amongst educators across the country.
When I was a classroom teacher I constantly struggled with this concept. I did not like or do much HW when I was in elementary or middle school. When I got to high school I realized I needed to do HW and as I got to college I realized I needed even more discipline in getting HW done and done on time. So I realized that as much as I did not want to assign HW to my students, I had to assign some in order to give them the HW skills they would need to succeed in high school and college.
That being said I had to figure out how to give the HW so I was making it worth their while. I spent time talking with my Principal and other teachers in the school. I decided that each night they would be required to do reading. This was of utmost importance to me. There is reading in every subject all the time so developing and maintain their reading skills is imperative. It shouldn’t be just reading, but reading for meaning. So each night there was some form of a question or two that went along with either a specific reading, or whatever book the student’s had chosen to read. (This is also a form of differentiation, in that it is an open ended question so there is not one right answer, but students can answer it at their level). I also usually gave some math practice. The material would be something that was being reinforced from classroom learning and I would have different HW for students. Then a couple times a week there would be a social studies or science activity as well. The HW however would never exceed 40-50 minutes for a fifth grader. The importance of the HW was to learn not only the content but the discipline of HW as a skill. It is really hard to be motivated after an 8 hour school day plus after school activates to then sit down and do HW. Besides dinner this left little time for the students to play. The more efficient they could learn to be at HW, the more extra time they would have as well!
In the article we read at, http://www.netc.org/focus/strategies/home.php, it references the same issues that I had to think through, and more. I enjoyed getting some validation from that article and being left with more to think about.