Maim is good for the def down debuff, and would mainly be useful solo. Bloodbath, too. If you're playing in a party most of the time, though, you really don't need any MRD skills.

Since the accuracy on maim sucks, it's most useful as an opening attack so you have 100% accuracy. Get a mob near death. nock 2 arrows, heavy shot to kill it, move on to the next mob, open with maim, then do raging strike + nocked lightshot.