I understand the concept of scoring the system as it is today. On the other hand I disagree emphatically with the premise for doing so.
A "general impressions" wrap-up paragraph would be fine. A rating system with a very low granularity (Thumbs up/even/down for example) would even be acceptable.
A score of 7.5 implies, at the very least, a granularity of 20. This is only useful in a case where you have either 20 binary criteria, or ~5 criteria with some kind of sub-scoring system. Where, or what, are these criteria? Are they implicitly, yet obviously, defined through the content or structure of the article? No.
I'm not defending the PS4 - I am ranting at the profligacy of meaningless scoring systems throughout the entire video games industry.
"But the PlayStation 4's focus on gaming — and only gaming — is undermined by a distinct lack of compelling software. That failing is sure to improve — better games and more of them will appear on the PlayStation 4 — but right now, this is a game console without a game to recommend it. Early adopters of the PS4 this fall are buying potential energy. We're just waiting for a place to spend it."
[1] http://www.polygon.com/a/ps4-review/conclusion