The reason that Gandalf's Ring did not seem to repel the forces of evil was that, that wasn't its purpose. Narya and Nenya were made for two different reasons. The reason that Cirdan gave Narya to Gandalf to begin with was to help him in his labors, to kindle hope in the hearts of the Free Peoples. To kindle anything, you need fire, or a flame of some sort, and Narya was the Rign of Fire. It served Gandalf's purpose.
Nenya was made for Galadriel, and it served to strengthen her defenses. Her duty was not to kindle hope in the hearts of the Free Peoples, it was to rule Lothlorien and help keep the forces of Mordor at bay. In that, she most definitely fulfilled her duty.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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