Critics were divided on
Left of the Middle, with several praising Natalie Imbruglia's emotive voice, pop appeal, and experimentation, while others criticized the album for lack of originality, overproduction, and failing to fully realize her potential. Greg Prato from
AllMusic gave the album a positive review, stating that "some of the material will be seen as pop fluff by certain listeners, but fans of popular latter-day female artists like
Paula Cole,
Sheryl Crow, and
Meredith Brooks will find Imbruglia's debut most enjoyable", and praised Imbruglia's willingness to experiment with electronic sound. Sara Scribner from the
Los Angeles Times gave the album 3 out of 4 stars, saying that the album is a "good pop record to break up to" and "Imbruglia dispels doubts with a smoky, believable voice tinged with just enough real-life ambivalence and anger". She found that "producer Phil Thornalley's talent for conjuring beats with attitude doesn’t hurt either."
Smash Hits wrote that "there are some brill tracks on the album, some as good as "Torn," but some weaker ones as well, and it's all a bit, well, serious, a bit anguished and breathles: Still, when Nat's good, she’s very, very good and if you liked her big chart hit, there's plenty on this album to keep you happy."
Q critic Steve Malins found that
Left of the Middle was "quietly impressive on first listen. However, with the exception of "Torn and Smoke," the furrowed, emotionally reserved songwriting has created a claustrophobic debut, which reveals that Imbruglia still has more skins to shed before she reaches her undoubted potential." However, Rob Sheffield from
Rolling Stone gave the album a negative review, with 2 out of 5 stars, saying that on her album, too many cooks spoil the broth, adding rock guitars and industrial clank beats that have nothing to do with her fey charms. Mark Bautz from
Entertainment Weekly also gave the album a negative review, highlighted the lack of originality, outdated production and its sonic similarity to
Rickie Lee and Alanis Morissette. Writing for
The Village Voice,
Robert Christgau found that "compared to the diluted simple syrup of
Swirl 360 or the teen-idol rappabilly of
Jimmy Ray, Imbruglia's modern pop is
Rumours [but] under all theistate-of-the-studio-art, her competent songs are no more distinctive than the competent songs of hundreds of less pretty women." ==Commercial performance==