Oh dear god I hate homework with a passion.
I didn't get homework until grade 8. Prior to that, there were the odd '2 week projects' that needed doing, that was the only 'homework' that I'd ever known. and I HATED those.
But my problem with homework is twofold. First, it violated the sanctity of the separation of school and home. To me, school was terrible and home was supposed to be separate and a haven from that. Homework dragged school right into the home psychologically.
Secondly, I firmly believe that all schoolwork should be able to be finished within the confines of the class time. Homework serves no useful purpose IMO, as it has no 'real life' parallel. If you can't finish your schoolwork in the time they have, they gave you too much.
I got worse grades after I started getting homework. It was just too overwhelming.