David Valkenet’s review published on Letterboxd :
William Friedkin is fast becoming one of my favorite directors. He's adapted to the different eras he has worked in and created wonderful and masterful films in each. Even his stinkers, such as Deal of the Century are interesting (I have yet to see Rules of Engagement).
Bug is a fairly unassuming and modest film about paranoia that is extremely effective. There is a crucial scene towards the end that goes for what felt like hours. Making the scene longer than is expected is such an amazing decision. The audience intellectually understands the point of the scene after the first minute or so but to extend it as Friedkin does really puts you on edge. By the end of the film I felt like I needed a shower.
I feel like the rating will go up after some rewatches but as it stand this is a wonderful piece of work from a director in his element.