But not in a book recommendation engine, otherwise it will recommend slop based on the stuff they forced you to read as a kid or the slop you read when you didn't know better because everyone was reading it.

You shouldn't punt anything you didn't like in there.

As a side note, when I was using a similar site it thought I was japanese or russian, because I like old time scyfi, and apparently the only people reading those obscure works also liked things written in japanese or russian. I don't know how to feel about that.