Modern reviews are generally positive. AllMusic's Bruce Eder calls the album "one of the most bracing progressive rock albums ever, and a successful vision of a musical path that the group might have taken but didn't", remarking how Deep Purple succeeded in combining "heavy metal's early, raw excitement, intensity, and boldness with progressive rock's complexity and intellectual scope." Jedd Beaudoin of PopMatters appreciates in his review the heavier sound of the songs and notices how "Evans sounds more and more out of place in a band that was increasingly more comfortable with stretching itself beyond the confines of pure pop pieces", like in the track "April", which he considers not only "the most ambitious thing on the entire record, but also arguably the best." David Bowling, in his Blogcritics column, reviews the album as "the least satisfying of their three early career releases, although it can also be considered their most adventurous" for its "meandering through a number of different styles and sounds." However, considering the growth shown by Blackmore and Lord as performers in this release, he concludes that it is "a fitting conclusion to the band's formative years." Martin Popoff praised the album for being "stronger, more aggressive and much better recorded" than "either of the first two records", showing the original work of "a strangely soulful psych band distinguished", with the exception of singer Evans, "by its hard-hitting players".