[2][4] Kalefah Sanneh of The New York Times found the melody to be simple, adding that "the beat keeps dropping out and returning and growing and shrinking, confounding expectations".

[9] An ode to monogamous relationships, the Pussycat Dolls croon during the chorus, "Nobody gonna love me better / I'ma stickwitu forever".

[12] Jeff Leeds of The New York Times noted that the release of the single coincided with the label strucking a deal with the toymaker Hasbro to create a line of dolls modeled after the group.

The aim of "Stickwitu" was to appeal to a wider and younger demographic, managing to receive airplay on outlets such as Radio Disney.

[13] In response to the release of the single, Scherzinger felt it was a strong move for them, as opposed to coming out with "Beep", noting: "occasionally we get the skeptical people, but we go, 'Give us a chance'.

[6] Taylor was surprised of "Stickwitu"'s release following "Don't Cha" and praised for being "beautifully sung, craftily produced and refreshingly gimmick-free".

[8] While reviewing PCD, Linda McGee of RTÉ wrote that the song displays "the real intensity of spirit in the music of the [group].

[3] Paul Scott of Stylus Magazine agreed with Sanneh adding that it's "pretty enough but just sort of mills around without getting up the courage to go [over the top], and that's actually a good thing".

[7] Spence D. of IGN shared similar thoughts with Murphy writing that although Scherzinger "has a pleasing enough voice" she "never really presents anything that could come close to being called a signature sound".

"[20] Sal Cinquenmani from Slant Magazine found it difficult to take the album's ballads—"Stickwitu" and "How Many Times, How Many Lies"—seriously when followed by "a song that begs a man to 'loosen up my buttons'".

[36] "Stickwitu" was certified platinum by the Recording Industry Association of America (RIAA) on July 11, 2007, for mastertone sales of one million units.

[55] The Pussycat Dolls enlisted Dick to direct the video as they wanted to maintain their momentum garnered from their debut single, "Don't Cha".

"[54] MTV's James Montgomery said that the video manages to be "high-fashion and low-brow, glamorous and, um, gritty at the same time",[55] where, according to Scherzinger, it's "a day in the life of the Pussycat Dolls on the road.

"[54] The director added that the music video is "a photographic [rendition of] the life of the Pussycat Dolls: traveling around, getting ready for gigs, being on the tour bus, doing a photo session, waking up in a motel, talking to the boyfriend on the phone, sound-checking.

"[55] On December 7, 2005, the Pussycat Dolls performed at the annual KIIS-FM Jingle Ball at the Shrine Auditorium in Los Angeles, California with some members wearing "festive candy-cane-striped belly shirts and red-and-green capri pants."

[57] On June 30, 2006, the group performed "Don't Cha", "Buttons" and "Stickwitu" on Good Morning America as part of its Summer Concert Series.

[58] On July 7, 2007, the Pussycat Dolls together with other artists performed at the Live Earth Concerts, which were held to raise awareness of global warming.

While reviewing the latter tour, Alex Macpherson of The Guardian praised Scherzinger's "inventive and versatile" vocals which are "gently crooning the sweet ballad.

"[65] In 2012, Scherzinger performed "Stickwitu" as part of a Pussycat Dolls medley throughout her first solo tour in support of her debut studio album, Killer Love (2011).