Commercially, Cómplices reached number one in Argentina, Chile, Colombia, Ecuador, Mexico, Peru, Spain, and the Billboard Top Latin Albums chart in the United States.

[3] Spanish singer and songwriter Rosana mentioned that she wrote songs for Luis Miguel's next project—as they shared the same record label—and she hoped he would accept them.

[4] On 14 March 2008, Luis Miguel announced that he planned to release an album on May of that year featuring original tracks composed by Spanish musician Manuel Alejandro and co-produced by both.

[6][7][8] Alejandro previously composed the tracks "Al Que Me Siga" and "Si Te Perdiera", for Luis Miguel's albums Mis Romances (2001) and Grandes Éxitos (2005), respectively.

[13] All but three of the songs are ballads with "De Nuevo el Paraíso", "Estrenando Amor", and "Tu Imaginación" being uptempo numbers which incorporate "funky" wind instruments, a female choir, and a "seductive rhythm.

"[15] The opening track, "Te Desean," is an "envy-drenched" song in which Luis Miguel sings to his beloved that "other men court her and desire her as he did before she was his.

"[16][11] The proceeding track "Tu Imaginación", a disco tune, has the artist enjoying listening to his lover's "diversity, fantasy and ambiguity.

[16] The final cut on the album, "Se Amaban", is about a love who "steals partners" and chronicles a couple "who adored each other, in whose relationship a stranger intervened, awakening black passions in her heart and sowing weeds in his.

She noted that Miguel "was all smiles, all upbeat attitude and genuinely happy to be there", and complimented the five-minute overture and video-clip reel that "Elvis might have admired".

Also commented that "Luismi appeared to be at his peak on his ranchera section — where his rich baritone sounds most at home, he even can hold his own with greats of the past".

AllMusic editor Andree Farias rated the album 3.5 of 5 stars, calling it his most "hopelessly romantic disc" of the artist's career and "pristinely executed by Latin pop standards.

[11] She lauded Luis Miguel's decision to collaborate with Alejandro, questioning why it took long for both artists to work together, and stated that the composer's "eye for detail" is "exquisite."

"[11] Billboard En Español critic Marcela Álvarez wrote a positive review of the album, also praising the collaboration between Luis Miguel and Alejandro.

"[13] A.D. Amorosi of The Philadelphia Inquirer, rating it three of four stars, named Luis Miguel "a Mexican Sinatra of sorts," comparing Alejandro's production as the Spanish version of Nelson Riddle.

Amorosi praised Luis Miguel's vocals as a "romantic voice whose caramel-coated tones oozed perfectly through the grandest of strings and the slightest of Latin rhythms.

"[66] In a mixed review of the album, El Nuevo Herald writer Sandra Palacios denoted the production as a result of Luis Miguel's experiences, and called it "retro, just like the 70's.

While admiring Luis Miguel's vocals, the writer criticized Cómplices as a "collection of cookie-cutter boring tracks" which would "put one to sleep.

"[63] Similarly, writing for Vida en el Valle, Olivia Ruiz found the songs to be "monotonous" and felt none of them stood out.

She regarded tracks like "De Nuevo al Paraíso" and "Tu Imaginación" giving "little variety to the sounds of the ballads" and surmised the disc is "perfect for a romantic evening.

"[65] In a negative review of Cómplices, José María Álvarez of Reforma criticized Luis Miguel for being unimaginative and felt the tracks were identical to each other.

He unfavorably regarded "Ay, Cariño" as an overtone of fellow Mexican singer Emannuel and found the strings on the record to be "bland.

[70] Cómplices was certified diamond by AMPROFON in just three weeks after its launch for sales of 400,000 copies and was the second best-selling album of 2008 in the country after Para Siempre (2007) by Vicente Fernández.