

"Can't Leave 'em Alone" was a moderate success in the US. Makkadah Selah of The Village Voice called the song "lifeless". Christian Hoard of Rolling Stone published "Ciara's still prone to diva blandness and silly little pop songs, which drags down the 50 Cent feature 'Can't Leave 'em Alone' ". Cibula of PopMatters published that it is "a very bad pop-lite song" and criticized the use of 50 Cent as a sexy bad boy. Other reviewers were more critical of the song.

Ken Barnes of USA TODAY called the song "pop-soul confection". published "Can't Leave 'em Alone" is a "mouth-watering smouldering smoothed groove", with the reviewer going on to say that it should have been the first single, and that It has "cross over potential that we see from Nelly & Kelly Rowland " and is "simply another Darkchild classic". "Can't Leave 'em Alone" received mixed reviews from music critics. "Can't Leave 'em Alone" is an ode to the hood boys anchored by a pair of verses from 50 Cent, featuring an "easy groove". Later, "So Hard" was confirmed to be the third US single, while "That's Right" would serve as the third internationally, but "Can't Leave 'em Alone", unexpectedly, replaced both songs. "Can't Leave 'em Alone", along with " That's Right", was originally a contender to be the second US and first worldwide single from the album, and a poll was posted on Ciara's MySpace page to have fans help her decide, but the other contender " Like a Boy" was chosen over both songs.
