OP - just so you're not alone here - I agree w/ you. I think "parent projects" are not good for anyone - the student, the parent, or the teacher who has to grade them.
We homeschool now, so it's no longer an issue for us, but it definitely was a big issue for me. Of course it's not the reason why we left traditional school, but it's on the list. I just saw no educational value in them, saw a lot of frustration, then getting into the classroom and having the one who the child truly did by himself sitting next to the one the engineer parent did by themselves was such an esteem buster for the kids. No amount of telling them "listen, there's no way little Johnny did that by himself, and you did yours all by yourself" helped.
So, I'm not here to debate any of this w/ anyone who disagrees with me, but wanted you to know you're not alone at all.