Well, I think the usual grading system is pretty straightforward, and it is what every coin collector learnt by heart since his first little steps in his hobby. It's only useful for sellers, to make selling easier and avoid having to write extensive descriptions. And every buyer knows that some sellers tend to overrate their coins in order to stimulate possible buyers.
In the case of Mitresh, it's a way of expressing love for his coin, nothing wrong with that, he is not
offering it for sale. It's like saying, my wife is the prettiest woman on earth.
Only the rating of the
Heraios tetradrachm can be discussed. Such an important coin merits an extensive description. To me, it looks like it has 'some wear', apart from the obvious little scratches on the head, and therefore it is VF.
Whether the wear (esp. on the horseman and the Nike) was caused by use or during the minting process should be discussed in the coin's description; the scratches must have been caused by use, >> so it is not EF. But, well, we have the picture. Pictures may deceive, but not so much in this case, I think.
-- Paul