To be perfectly fair, this system works to point out those awful bug filled pieces of shit, like THPS 5, and the games that are truly masterpieces and define their generation, like Uncharted 2 or Super Mario Galaxy. For the middle ground, games that are between 90 and 60 or so, I tend to think it's all in the same category: try it out because it works and should be fun. Whether it has a green score or a yellow score is a bit elitist
At best, critical scoring systems can be used as coarse-grain indicators of quality. It's possible, for example, to categorise something as "good" or "crap" or "mediocre". Attempting to make finer categorisation, especially using a 100 point scale, is misguided as it creates the appearance of meaningful distinction where none exists. Worse still is trying to use these scores to create rankings. Ugh. So bad, I can't even.