"Club Rocker" is an electropop song with "twisted techno riffs" and a "show–off production"; its "jerky" refrain is accompanied by "massive" electro beats. Lyrically, the track speaks about celebrating and partying. Jonathan Hamard from Pure Charts saw the recording as "much less stubborn" than her previous "Hot" (2008), "Amazing" (2009) and "Sun Is Up" (2010). In another article, the same editor compared "Club Rocker" to "the electro vein" of "Hot", but called it "more electric". Similarly, Jérémy B. of French website Melty wrote: "Definitely a sound for clubs [...]."
