The album received positive reviews from music critics. Lani L writing for Tuonela Magazine stated, "
The End of Heartache" is an essential album to listen to regardless of whether or not you actually like metalcore
per se. I would even go so far as to claim that, especially, if you dislike the genre – or what it has become over the years – you really should listen to this album."
Blabbermouth.net wrote "The End Of Heartache" features ten songs and two brief instrumentals, and its relatively short (under 43 minutes) length and wall-to-wall sequencing (all the songs bleed into each other) ensure that the music doesn't get stale and the listener only gets a breath when the band permits.” Finishing with, "It may be the end of heartache, but Killswitch Engage shows that metal is not just breathing, but indisputably alive." Eduardo Rivadavia of
AllMusic praised Howard Jones for talking over Jesse Leaches spot stating, "Jones effortlessly matches his predecessor's talent for both clean singing and hardcore-style screaming." Ultimate Guitar stated, "This album definitly stands up to KsE's past works but builds on every aspect and is a sure improvement." Jonathan of Inside Pulse added, "The End of Heartache" is the perfect example of a "can’t stop" release: one you start listening and get involved in the music, there never seems a good point to turn it off. Each song bleeds well into the next. The album, as a whole, is super-tight." The album won Best Album at the 2004
Metal Hammer Golden Gods Awards. The title track was nominated for
Best Metal Performance at the
47th Annual Grammy Awards. In a 2022 poll held by
Revolver Magazine the lead single "Rose of Sharyn" was voted the greatest metalcore song of all time. The publication added "Everything about this song is a masterclass in metalcore craftsmanship — the chunky production, the quality of that lead riff, the way Jones’ mighty belt contrasts with Adam Dutkiewicz’s croons. It’s just perfect."
Accolades == Legacy ==