 Robert Copsey of Digital Spy called it " anthemic " and noted the song would become a future single . Rich Juzwiak of The Village Voice called " I Wanna Go " the highlight of the album , and said " get ready for [ it ] to score your summer . " However , Juzwiak went on to note that Spears ' vocals are heavily manipulated to maximize the chorus 's potential , even though " the joy she sings about is palpable . " The Chicago Sun @-@ Times journalist Thomas Conner also noted that the singer 's vocals were processed to the point " these songs could be sung by anyone " , exemplifying " ' I Wanna Go ' tweaks her up so high she could be Jackie Evancho . " Andy Gill of The Independent also criticized the singer 's vocals on Femme Fatale , stating that they sounded more programmed than natural , with " even the little whistling hook in ' I Wanna Go ' has a synthetic character about it . " 
