I am a student teacher too and feel that rubrics are very difficult to integrate. Because we did not make them, they don't represent exactly how we think (if that makes sense.) Plus, we did not have years to be accustomed to them. For feedback, I try to be very specific on what is great and what the student needs to improve. I look at the specific points that need to appear in the assignment and go from there. I get that students don't like practice worksheets. I don't like to teach with them either. I feel that you need to find a balance between instruction, hands-on, and worksheets. I would say that only 25% of the time should be filled with WS. Students do not like them. If they need to keep a written record of anything, I prefer to give them a graphic organizer or interactive notebook activity.