with current changes, the change to shatter shot isn't even a buff for MM this was skil you pretty much used often.
Since 75% of the healers can't Heal anymore, i'd say dump it...
A tank won't be of much issue, shatter shot helps alot if you're MM but isn't mandatory.
Standard MM PvE, you can classify it more of cd rather the part of your standard rotation.
just my two cents