"Wow" received mainly positive reviews from contemporary music critics.
The Boston Globe had compared "Wow" with American singer
Madonna's 1983 single "
Holiday", but added "Wow" is "Holiday" on studio steroids". Kelefa Sanneh from
The New York Times had said that "Wow"; "updates 80s-era Madonna". Evan Sawdey
MusicOMH gave it a very positive review, as he compared the songs to Minogue's previous songs "
Shocked", "
Too Far", "
Come into My World" and "
The Loco-Motion", saying in his extended review; "it’s jam-packed with peppy melody, built around a simple, addictive piano melody that is soon shot into the pop stratosphere." He also said that the song is a "great track". Dave Hughes from
Slant Magazine gave it a positive review, saying ""Wow" is a pretty great summation of the commercially successful aspects of Minogue's career to date—a hyperactive juvenile disco track full of fun, big-budget whooshes and drops, something utterly disposable that she sells without shame." They also highlighted the song as an album standout. However, Alex Fletcher of
Digital Spy wrote that "Wow" "doesn't have the 'oomph' factor to make us fall for her like we have in the past", but the song's "disco swirls and whooshing synths are great fun". In a review for
The Guardian, Alexis Petridis called the song "fantastic" and compared it to Minogue's songs with
Stock, Aitken and Waterman.
Pitchfork Media reviewer Tom Ewing wrote that the song's "excitement is infectious" even though its "funked-up electro sexiness may feel contrived". In his book
The Blue in the Air (2011), Marcello Carlin praises the song's "central motif of processed-mouths-as-
muted-plunger-trombone-section". ==Chart performance==