Sour Soul has received generally favorable reviews from music critics. At Metacritic, which assigns a weighted average score out of 100 to reviews from mainstream critics, the album received an average score of 77, based on 17 reviews. In a mixed review for Exclaim!, Eric Zaworski noted that the record “hurriedly finishes without giving its concepts enough time to bloom,” further explaining that “the production is top-notch, but Ghost rarely shifts into uncharted lyrical territory, holding back Sour Soul’s otherwise consistent production.
In an extremely positive review, giving the album a score of 9 out of 10, Sam Moore wrote for Drowned in Sound that “Sour Soul is sublime.” Adding that “rather than standing around starstruck, BBNG have more than proven their worth as Ghostface’s backing band. All tracks are produced by Frank Dukes and BadBadNotGood. Ghostface does not appear on track 1, 5 and 12, which are instrumental tracks. Additional production by Wayne Gordon.