User opinions on 'Supergirl' reveal a series that starts strong with engaging storylines and a likable cast, but experiences a noticeable decline in quality from the fourth season onwards. Many appreciate the show's initial depth and superhero excitement, though later seasons are criticized for weaker plots and less compelling writing. The series finale and some individual episodes receive mixed reactions, with some viewers left unsatisfied.

👍 Early seasons praised for strong storytelling.

👎 Quality dips in later seasons.