Letter rankings are irrelevant. You can get an A with non-trivial misses on most maps if you're an accurate player. Evaluation would likely have to be done piecewise with a nonlinear weighting for difficulty if we are to work under the assumption that uniform difficulty and easier difficulty with spikes are actually of 2 different difficulties despite mapping to the same average difficulty neighborhood.Edit: I guess food for thought - Is a map with a largely uniform difficulty easier or harder than a map with a large difficulty spike?That largely depends. There are 2 ways ways I can think of to rate such maps correctly:
- 1) Separate ratings by how difficult it is to get the letter ranking
2) Average the maps' difficulty peaks based on a weighting system pp uses.
I have already tried doing it the 2nd way, and yielded results similar to this: