The song was written by Steve Bender, Toni Cottura and Rodney Hardison.

Larry Flick from Billboard felt that songs like "I Wanna B with U" "are dance music in its purest and celebratory form.

"[3] A reviewer from Music Week gave it four out of five, writing, "A reggae-flavoured, summery song with the oft-repeated title line providing a great hook.

"[4] Rupert Howe from NME was less enthustiastic, saying, "Fun Factory may look like yet another instant melting-pot-noodle of a Eurobeat combo along the lines of Clock/Corona/The Real McCoy etc, but in a trick of Faustian proportions turn out to be merely a horrible tuneless facsimile of the already horrible and tuneless Ace of Base.

"[5] James Hamilton from the Record Mirror Dance Update described it as a "plaintive girl chanted and gruff chaps rapped Euro reggae lurcher".