I was asked to post a blog about what ranking I use on my reviews...
So, jedivan, here it goes

It's a borrowed ranking scale, borrowed from the Harry Potter books, so I guess I should pay royalties or something to Mrs J.K. Rowling for the use of it...

It's just the marks they give in the Hogwarts School:

Pass Grades:

Outstanding (O)
Exceeds Expectations (E)
Acceptable (A)

Fail Grades:

Poor (P)
Dreadful (D)
Troll (T)

With Outstanding being the highest grade possible and Troll the lowest...

And yep, I know, I'm using Harry Potter grades to rank the SW EU books...