Since their founding the band's concept did not change drastically; guitarist Kaïdine described as follows: "The main idea was to play slow and loud as fuck.

[6] After the reissue of Mer Morte, Lords Of Metal called the band a "deep black minimalistic, slow, humongous doom monster".

[8] Reviewing the same album, Heathen Harvest states that it by no means bad, but calls Monarch a copycat of pioneering bands like Boris, Pelican, Isis and Khanate.

[9] German metal.de called the 2007 album Speak Of The Sea "meaningless drone tracks, which basic idea almost too obviously and thus bold was stolen from Khanate".

Monarch pay tribute to Black Sabbath also by making earth shaking music and in trying something new with a lot of courage and a portion of madness not to underrate […]".

[11] Village Voice called a New York concert in November 2010 "a focused, intense performance, utterly lacking the catharsis that's metal's usual stock-in-trade".