Upon its release, several reviewers highlighted "Helena" as a standout track on
Three Cheers for Sweet Revenge. A staff editor of
IGN described "Helena" as a song that "covers every base", featuring every element that one would typically expect out of an emo song. and Ian Mathers of
Stylus highlighted the song's usage as an opening track. Upon the song's release as a single,
Billboard staff described the track as one that "bursts with energy" and considered it more catchy than the album's lead single, "
I'm Not Okay (I Promise)". In retrospective rankings, "Helena" is often regarded as one of the best songs from My Chemical Romance's discography.
Louder's Marianne Eloise and
Stereogum's Margaret Farrell both ranked it as the second best in the band's discography, and both
Exclaim! and
Kerrang! ranked it fourth. "Helena" has also been considered one of the best emo songs of all time by
Variety and
Vulture, and has also been considered My Chemical Romance's breakout hit. With the popularity of "Helena" and its music video, My Chemical Romance became one of the most popular emo bands of the 2000s. It also contributed to the commercial success of its parent album,
Three Cheers for Sweet Revenge, which went on to sell three million units. It remains My Chemical Romance's second most successful song in the United States, behind "
Welcome to the Black Parade".
Louder's Marianne Eloise wrote that, while "I'm Not Okay (I Promise)" was a more well remembered track from the album, "Helena" was a turning point for the band as their first widespread hit, as well as a song that changed emo on a commercial level. They further described the song as a "beautiful, mournful track", and one of the most unique from the band. Bryan Reesman of
American Songwriter described "Helena" as a song that not only stood out among the rest of My Chemical Romance's discography, but early 2000s rock music as a whole. Aliya Chaudhry of
Stereogum wrote that "Helena" and its associated music video were cultural touchstones for emo and pop-punk. == Music video ==