Holy shit, this was so good. Allow me to reference critic reviews:
Noel Murray and Scott Tobias of The A.V. Club put Blow Out at #1 of their list of De Palma's besThe quintessential De Palma film, this study of a movie craftsman investigating a political cover-up marries suspense, sick humor, sexuality, and leftist cynicism into an endlessly reflective study of art imitating life imitating art.
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In 2023, Time selected Blow Out as part of their list 100 Best Movies of the Past 10 Decades, praising it as "a film filled with mistrust, one where the ghosts of Chappaquiddick and the Zapruder film lurk in the corners."