The Sox come in at #9, which I think we can generally agree is a fair ranking. He seems a little conservative on some elements (I've heard better reviews of Bradley for example) but suggests that the high-upside guys in the low minors could spur a quick climb.
9) Boston Red Sox (11): Very solid farm system. Strengths: Bogaerts can/will be an All-Star, and Bradley should be a strong regular. Good depth in Grade B-/C+ types. System could jump several spots next year if low-level sleepers (Cody Kukuk, Jose Vinicio for example) take a step forward. Weaknesses: some of the tools guys and livelier arms haven't developed as hoped.