In +50 content, they're "okay." We finally have a DPS finisher and a DoT, which brings us categorically up to par with other jobs in the game (but still not really all that unique at all).

Rage of Halone is more useful while you're gearing up and immediately after the pull (or when trying to recover an errant mob from that leet BLM who got it before you could). But once you've got enough enmity on a boss or the mob you're focusing, Royal Authority is where it's at.

You'll want to make sure to try to keep Goring Blade up as much as possible says the PLD who almost never keeps it up. It'll help with enmity and is a pretty high-potency combo when the DoT runs its course.

Sheltron is situational, especially because there's so little physical damage going out nowadays (there may be more in Mocianne's and Pharos Hard).

Divine Veil is also situational, and you'll want to put a macro into it to make sure your healers know to heal you to activate it.

Clemency can also be pretty beastly, but is definitely stronger when you're off-tanking in Slaying gear (I've noticed a ~2500HP dip in its effectiveness since switching from Slaying to Fending at my healer's request). The 3s cast time makes it hard to use, but you can use it to keep your party up if your healer had to AFK for a few seconds.

All in all, they're not bad because they function, but they're not exactly great, either.