Writing in
RAM in July 1976, Bob Edmunds described the album as being "as impressive as anything Yes have produced collectively... Musicians with greater skills (e.g.
Mike Oldfield) have created instrumental works on this scale but have always been denied access to the wonderful instrument of Jon Anderson's voice. Endless tours have done nothing to detract from one of the richest, purest voices in rock … .
Olias has a continuity of intensity rarely found on any album, let alone one this ambitious. It won't go down too well with those who reject anything except full-tilt rock'n'roll. But there's no way you can deny the sheer
grandeur of Jon Anderson's music, no matter what opinions you hold about rock." Paul Stump's 1997
History of Progressive Rock called the album "probably the most complete manifesto to Progressive ideology (infinitely more so than
Tales from Topographic Oceans|[Tales from] Topographic [Oceans])." Stump praised the album's divergence from the normally accepted practices and language of mainstream rock, while noting that it is also very accessible to a mainstream rock audience. In
AllMusic, Dave Connolly concluded "the idea may seem overly ambitious, but Anderson fills the record with enough magical moments to delight fans of Yes' mystic side... at no point does the music lose its spellbinding effect for lack of sonic detail.
Olias of Sunhillow is faithful to the spirit of Yes, though decidedly more airy than that band's visceral style ...
Olias of Sunhillow is not the missing Yes album some might hope it to be, though it does prefigure the later
Jon & Vangelis collaborations of the '80s." Writing on his own
Progrography website, Connolly has also commented that "it's not a stretch to say that
Olias of Sunhillow looks and sounds like [Roger] Dean's previous Yes artwork come to life. Since Anderson himself handles all the instruments, the album is an airier affair than Yes, and yet at the heart of these songs is the same captivating, intoxicating core that the singer brought to that band....
Olias of Sunhillow is the one Anderson album most likely to please Yes fans, immersed as it is in their mystical aura. It's also a gorgeously packaged product (in LP form, anyway), which helps set the mood immeasurably." Writing about
Olias of Sunhillow on his
Mewsings blog in 2009 (thirty-three years after the album's initial release), Murray Ewing reflected "there’s a dangerous swerve towards the New Age in Anderson’s first solo album, both in the optimistic whimsy of its fantasy world, and the musical palette of soft, sparkling synths and world instruments. Thankfully, it easily escapes that particular doldrum of musical hell through sheer energy (on the musical front) and sheer weirdness (on the fantasy front). This isn’t music to attune your chakras to, it’s adventurous, full of drama, uplifting melodies, evocative soundscapes, and a fresh unearthliness that makes it the only fantasy album I can think of which genuinely sounds like it could have come from another world."
Classic Rock said the album's lyrics were "as preposterous as they come." ==Reissues==