http://www.adventuregamers.com/scoringsystem.php
I enjoy your site for its ratings but I believe you are very generous with the "3.5 to 4" phrasing on the 4 stars, maybe it has to be only for 4 stars and let people derive that 3.5 is just something between 3 and 4.
The reason for this is that I consistently see the games that you rate with 3.5 to be ..almost mediocre. They are ..good-ish, but really you can see the flaws easily.
For example, the first Back to the Future I just played was 3.5. It wasn't completely bad but I could see major flaws mainly in its monolithic gameplay, shallow story and even "just ok" characters.
I would definitely not recommend it to "anyone without hesitation" (which is what "3.5 to 4" states). I would put it closer to 3 or at least slightly better.
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Actually BTTFuture 1 was rated 4 which means I disagree with your rating but I guess the above statement remains but I guess ignore the BTTF reference.