it varies so from teacher to teacher. my daughter's last year CCD teacher was filipina, very strict and gave them homework. this year it was team taught, they watched a lot of movies and had no homework.
This year, I had two children whose classes covered a lot of material, and two that were pretty slack. Since we do religion study at home, I don't worry too much about it, as long as they're not being taught anything erroneous at the parish. But it's neglectful of the children who aren't getting any other religious education.