Review miningDifficulty score
An estimate of how hard it is to reach the top of a keyword, derived from the strength of the incumbents.
Difficulty is computed from the rating counts, averages and metadata fit of the apps already ranking for the keyword. A high score says a metadata edit alone will not get you in.
It has to be read next to popularity: high popularity with low difficulty is the ideal target, and it is rare. On a keyword already inside the cusp band the move can be worth making even at high difficulty - the distance is already closed.