Featuring a running time over three and a half hours long, the film is a generational portrait of youth blending documentary and fiction pieces.

[4] Pablo Vázquez of Fotogramas scored 5 out of 5 stars, extolling the absence of any sort of imposture, while noting that its extended runtime perhaps will dissuade cowards, assessing the film to be "a cum laude thesis with which its director embraces his maturity as a filmmaker".

[5] Carmen L. Lobo of La Razón gave it 4 out of 5 stars, considering "its splendid, immersive direction, and the optimism and nostalgia enveloping the film" to be the best thing about Who's Stopping Us.

[6] Quim Casas of El Periódico de Catalunya rated the film with 4 out of 5 stars, considering that the vast amount of material "has taken an exciting form, in different blocks perfectly articulated with each other.

"[7] Jonathan Romney of ScreenDaily wrote that the film is "not as revelatory as it intends, this is an only intermittently fascinating watch, an over-extended experiment that doesn't quite hold its own against 21st-century cinema's more incisive portraits of youth".