It is not the way you are thinking about it.So how many stars would an IEM have that has same or more advantages than IE600 and far fewer problems?
8 stars? 9?
It is not that the rating has to be applied with fixed or simple rules, but at least it should be consistent, and at least for me it is not consistent that an IEM with as many negative points as positive has a 9/10, or almost perfect.
It's one of the things that keeps getting me down on audio reviews, and I know it happens to a lot of other people I've discussed it with.
And that's why I say it, simply.
Sometimes the negatives are when compared to the competition or high tier earphones.
The star rating, which should always be treated with a grain of salt, reflects the actual experience when listening to music with the rated product.
This is a 4.5 star but also the much cheaper DUNU Titan S is a 4.5 star.
It is difficult to explain, people should be better read the whole text than hanging in the rating.
The IE300 is 4 star rating, then there is the Headfi system with 5 stars with half increments.
Different than a rating system with all the decimals.
My advice is don't hang into the rating just read to get an idea.
Then you should listen by yourself.