I do use a rubric for grading homework. I see homework as an opportunity to practice and learn from mistakes. My rubric focuses on, completeness, effort (evidence of all problems attempted, if a student can't get a problem they need to show how far they got and write a question about where they are stuck) and neatness( proper spacing between problems, problems are numbered, units are labeled). I do not grade homework for correct answers. I do spot-check 1 or 2 problems to check understanding as I am going around. I never collect the h.w, I just spot-check.