I've found over the years that my children's worst teachers were the ones who assigned the most homework. Invariably, they supplemented their poor focus on conveying concepts with lots and lots of homework.
A ton of homework is a smell that I've learned to look into in order to see if I need to meet with the teacher and possibly talk to the school administration.
I remember a math class from high school whose homework seemed like it took me way too long to complete. Looking back, the teacher was actually one of my best and the length of time I spent on that homework was more of a signal that I didn't excel in the course or subject matter.
But then I had other teachers who assigned homework which was likely motivated by a need to have things in the gradebook that weren't tests
A ton of homework is a smell that I've learned to look into in order to see if I need to meet with the teacher and possibly talk to the school administration.