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It's definitely worth it. In prolonged battles, Seraphs can inflict enormous damage. The question is, will they survive long enough to do so? A skilled opponent will perfectly understand their danger.
12 Paladins and 3 Seraphs vs. 8 Cyclops. (there were other units, but let's focus on this trio)
Paladins move: Cyclops attack - 2 die
Cyclops: counterattack: 3 Paladins go to the grave
Cyclops: attack: 4 Paladins are destroyed!
Seraphs: divine retribution: 5 Cyclops are killed!
My hero, a Knight, kills the last Cyclops.
And if there had been Archangels, the losses would have been much greater!