Critical reception
Among contemporary reviews of Baal, the Evening Telegraph wrote that the EP allowed listeners to remind themselves of "the decadence-ridden music" of the television adaptation. Terry Lawson of The Journal-Herald believed only Bowie fans would enjoy the release and opined that, as none of the compositions are as strong as Brecht's later work with Kurt Weill, the release is "mostly interesting for the novelty of hearing Bowie tackle the kind of material that serves as inspiration for his own artier, cabaret-influenced songs." A reviewer for Melody Maker found Bowie's interest in Brecht unsurprising, given the "drama, angst, brutal descriptiveness and vivid seediness" in the latter's work and his relocation to Berlin. The reviewer wrote that "Bowie's back to sounding like Anthony Newley and appears to bleed a great deal in the process." Joe Selvin of The San Francisco Examiner wrote that Bowie adapted the lurid lyrics to "symphonic-style accompaniment", "digging into the arcane numbers as passionately as Anthony Newley might, in an extraordinary, powerful performance that marks Bowie as one of the most provocative interpreters of popular music to emerge from the rock field."
The Kitchener-Waterloo Record emphasised that Baal contains traditional material "and definitely not rock and roll", finding it "loaded with unusual pictures", and believed Bowie's fans would enjoy but most others would ignore it. Harlow Star reviewer Roger Fulton felt that although fans of Bowie and rock music in general "will find these songs a little hard to swallow", as "their dramatic air is difficult to take", the EP nonetheless shows "how complete a performer Bowie is, and how good an interpretive singer", describing the release as unusual but "by no means inaccessible." New Musical Express writer Biba Kopf (Chris Bohn) said "Baal has no Kurt Weill tune to disguise its vibrant dirtiness or whiff of Weimar decadence to perfume its filthy smells." Comparing Bowie to two singers who also had hits with Brecht material, Bobby Darin and the Doors' Jim Morrison, Kopf felt that Bowie was the unlikeliest interpreter "and therefore the one [Brecht would] probably love best." In another piece, Bohn said the "excellent" EP showed Bowie "having a ball whooping through a young Brecht at his lebenslustful best."
Retrospectively, Dave Thompson of AllMusic describes Baal as "an uncompromising collection, considerably truer to Brecht than many outsiders expected, with its closest relatives within Bowie's own catalog being his occasional assaults on the Jacques Brel songbook", such as "Amsterdam" (1973). Thompson still considered this comparison flawed, as "Baal served up a side of Bowie that he had often claimed existed, but which even his closest friends had seldom seen." Willett, as a Brecht historian, considered the EP to be superior to the television play, writing that RCA presented the release "exceptionally well" and that it showcased Bowie "as one of the most gripping Brecht singers of all time, sounding even more committed to the material than in the play, and helped now by Muldowney's very clever and compelling arrangements." Buckley describes the soundtrack EP as "a bravura performance" and describes "Baal's Hymn" as the undoubted highlight, deeming Bowie's dynamic, dramatic vocal on the song to be "possibly the best of his career." Chris O'Leary calls the EP "a kiss-off to a label Bowie had grown to hate" and writes that "Baal is often considered a strange cul-de-sac in Bowie's career... But Baal, after Scary Monsters, is Bowie's best record of the decade [1980s]."