when you look at it from the review page, it doesn't factor in the N/A scores. (in this case vocals, musicianship, lyrics). I'm not sure why he didn't give a score for those, because it's not like these songs don't contain them, maybe he was just grading it on being a compilation as he's probably already heard the songs on other releases. But yeah, the N/A scores are counted out once you click the review and actually read it. So he actually gave it an 88.
I didn't score them, because it's not really fair to group them all together when individually, some vary and are better/worse than others. Score isn't really what matters with an album like this. For the amount of tunes you're getting for a low price, you're either buying it or not.