Brian De Palma is one of the all time great directors of the New Hollywood era. Blow Out, Dressed to Kill, Obsession, Phantom of the Paradise...all all time classics. There are two Brian De Palmas. The amazing director who is on par with Martin Scorsese and the one who did the occasional studio film mostly just to just ensure funding for his personal projects. I hope you are not judging him on Mission Impossible or Scarface but on his work such as Blow Out or Phantom of the Paradise.
Blow Out is the work of an amazing director. De Palma is am an incrediblely skilled director who had a significant impact on the face of cinema that still resonates to this day.