After posting this, I did a search online regarding the subject. There was actually a long thread on some food/cooking site with people arguing about whether to use ricotta or cottage cheese. I was amazed because like everyone here I've always used ricotta. Guess there is a contingent that really likes cottage cheese. Maybe if your mother made lasagna with cottage cheese when you were growing up it might just be what you're used to, but I just don't see the appeal.