This looked good to me, I gave it six points. I don't really agree with the "dirt is out of focus" comment, there seems to be a good amount of focus to me.
Sometimes less is more. This is one of those times. This is so simple and directly to the point. I'm not bothered by the focus, and didn't even notice it until I read the other comments. Good composition. I like it.
Good composition and definitely meets the challenge! Lots of dirt here. If this were a bit sharper (camera shake?) this would have done very well, I think.
The lighting is good, and I like the composition a lot (the diagonal line formed is very attractive). However, it almost gives me a headache to look at it because it's just a bit blurry (camera shake?).
I just love this photo. IMHO, i wish there wasn't such a tight crop at the bottom, but i'm just being super nit-picky. I still give it a 10. Wonderfully done. :)