I do not think that Feanor was overrated. He created the silmirills, perhaps the Palantiri, possibly invented those lamps that the Noldor that Tuor met in the Rainbow cleft had(In the Unfinished Tales)and the Tengwar, one of the most used writing systems in Arda. Not to mention that he was the greatest craftsman in middle earth besides Aule.
I argree that he was an @$$ because he was always threatening his half-brothers and he caused the kinslaying at Aqualonde,
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