1UP a bit harsh on Disgaea 3?

[Euphoria14]

bbsin said:
1up has stated many times that their new grading scale does not convert directly into a numeric grading system.

 

Then sites like Gamerankings and Metacritic should not use them in their overall averages. As it looks to be that they just take a wild guess on what they think these letters mean, considering both sites score these letters differently.