Barring reading the complete review, your scoring system is interesting. I wouldn't recommend just a "decent" (6) game to anyone.
That's because the commonly used review scales have 7 as average and 6 is already bad territory (hence why 74 already constitutes yellow on Metacritic). Mediocre (=average) games get pushed so close to good games that there's barely any distinction anymore. Something's wrong when games that differ notably in quality have basically the same score.
When I did A Biased Review many people perceived me as being too harsh, but when I reflect on it, I consider more reviews as too generous than I do as too harsh.