This sounds nice. What determines whether a move is "usually useless" is dynamic, though, e.g. Dark Void being "usually useless" if you are building for a Gen7 or Gen8 format.
What I imagine happening is /ms useful, 8 showing moves that are always useful in gen 8 for singles or doubles, as well as showing sometimes-useful moves that are decent more often than not (counter, rock tomb....), but not including more niche moves (electro ball, petal dance...)