I give it a 6/10 I guess. While I like the simple approach ... I am also missing a few basic bells and whistles. I'd love to see a search feature and/or a way to tag or categorize posts for later reference. Sometimes I think "oh, I remember reading about that on YC" but its nearly impossible to find again.

Also the text (as I'm typing this) in the form field is too lightly colored and the text area is too small for me.