Michigan Chronicle critic Ashley Stevenson wrote that "throughout the album, Brandy toys with techno undertones without losing her iconic sultriness bending her voice to each track, even doing some rapping. Although the album is met with mild moments of mediocrity, it never lacks enticement." Similarly, Mike Weiss from Idolator wrote that "this project shows new facets of her wonderful instrument as she muses on matters of the heart over multi-layered, often mid-tempo production. In short, B7 is a mood. This is the kind of album that needs to be listened to from beginning to end (a couple of times), in order to fully appreciate the very personal journey that Brandy takes us on." In her review for The Observer, Kadish Morris was critical with Brandy's rapping effort on songs such as "High Heels" but praised the album's "familiar acrobatic vocals and sublime harmonies." Will Lavin from NME gave a positive review, stating that although the album "could probably benefit from an injection of tempo from time to time [...] it mostly thrives, thanks to her unwavering resilience, the unique texture of her vocals and the stellar production courtesy of DJ Camper, Lonnie Smalls II and the late LaShawn Daniels." Lavin added the new album had been worth the wait, "because it has helped one of R&B's most revered talents find her smile again." Joel Campbell from The Voice called the album a "first masterpiece as an independent artist", whilst Danielle Brissett for Rated RnB praised the project for the "Sonorous harmonies, potent backgrounds and ad-libs, and an influential delivery that true connoisseurs can detect. Clash editor Robin Murray called the album "a triumph. A record worth savouring, it sits alongside NewGen R&B talent [...] while retaining that classic touch." However, Murray also picked out "Borderline", stating the track is "no more than nice – pleasing on the ear, tugging at the heartstrings, but fail[s] to match the gravitational pull of the record's true highlights." Stephen Kearse for Pitchfork gave the album 6.8 out of 10, feeling that Brandy sounded "poised and warm but lack[ed] some spark". Kearse added "There's a strong sense of distance to B7, as if Brandy is recounting stories secondhand despite them ostensibly being her own. She's described the record [...] as "freeing," but she generally feels more withdrawn than liberated."
