When I started attending at Stockholm University I quickly discovered they were using the ECTS A-F/Fx grading scheme. No problem, grading is grading, grades are grades, right? But the difference in the ranges can get confusing sometimes, while objectively, they should not.
A and B are more tightly linked with "I did a good job" than C-E. If I get a D here, it feels like a F, while in the 1-10 scale, it is still a 7; not great, but definitely passed. A B feels less that a 9, a C less than a 8...
It is completely subjective, but the fact F covers 1-5 and E-A cover the rest forces you to think twice before you get too disappointed :-P