Technically speaking, all classes benefit from the arrow card UP TO A CERTAIN POINT. It's perhaps the one card that actually boosts all three roles in a party (tanks hit faster for more enmity, healers heal faster to catch up easier, DPS spanks mobs faster). TP and cooldown/GCD synergy do become issues at a certain point, but that's also individuals. A skilled DPS will be able to factor in an Arrow card and adapt to the increase. (It also gives you a chance to actually use Spire on a DPS...)

The one DPS that will not mind Arrow in any circumstances is BLM, simply because they are not resource limited. For any other DPS tho, AoE is generally not a good time to Arrow (In fact, I find better use chucking Ewer on the SMN or Spire on the melee/ranged just so they can pull off a few more Blizzard IIs/AoE weaponskills before going dry).

Arrow is always useful for you, but it falls off unless you are constantly using your GCDs. Enhanced Arrow on yourself as your Malefic II/Gravity spam tho...