In general you want to avoid casting it, which is why I hope SE can work in some mechanic later that makes that untrue (just because I like casting it and don't want to have things go bad just to have a reason to use it), but Clemency has saved me in many groups- in tight situations it can mean a lot and now we can drop 5 of them in a row like it's nothing lol.
Also doesn't have to be you or your healer's fault haha, it could be your deeps fault

. If you're healer is going on a raise spree, you could give them some back up cures before a mechanic ruins their efforts (or if their mp is dead).
I guess you could be like "but just get a better group then" but I like that Paladin is sort of the job that encourages potential stability and allows people to be human without it all going horribly wrong, maybe that ship could do without one more core post or that extra plating but Paladin is going to put another one there anyways because we don't need no rickety ship

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When using it to bring stability in truly chaotic situations I think it feels really good.