The guidelines say acceptable posts are include "anything that gratifies one's intellectual curiosity".

This one might be at the less gratifying end of the spectrum, but if it gets a lot of votes and a worthwhile discussion develops, that generally indicates that it's a solid enough post.

Mediocre posts can sometimes spawn surprisingly good discussions.

But if you don't like a post, you can always flag it. If enough people do that it will be demoted down/off the front page.