Foresight, Bloodbath, Mercy Stroke, and situationally maybe kind of Fracture sometimes. Skull Sunder is the only one with absolutely no use.
If nothing else, you want the Marauder skills largely because the
Conjurer skills PLD can use, with the exception of Stoneskin, suck. You can't Raise in combat, which is the only time Raise would
really be worth taking. You don't have enough MND to make Cure worth the time it takes to cast. You'll always have a healer, so the only time you'd use Protect is when someone's been Raised in combat and somehow the healer doesn't have time to recast Protect, but you somehow do. Stoneskin is awesome, though.