[1] The album has been highly regarded by music writers due mostly to its production, whose heavy and original use of sampling influenced hip hop producers for a considerable portion of the 1990s.

"[5] In his book Classic Material: The Hip-Hop Album Guide, Oliver Wang writes that Large Professor as a producer "thinks in complete song structure, never focusing on one single element—a loop, a break—but always juggling them in unison.

J the Sultan of The Source hailed it as "New York hip-hop at its best", praising its "slamming beats and smooth, nod-your-head-to-this grooves thick with jazz-infused samples", as well as the "clever rhymes that you want to follow word-for-word.

"[8] Entertainment Weekly's James Bernard wrote that "Main Source may not break much new ground, but [it] offer[s] a clever, quietly seductive collection in which the bass and drum tracks casually strut instead of stomp, and the sparse samples of guitar and horns allow the Large Professor's voice to take center stage.

[1] In 2004's The New Rolling Stone Album Guide, Peter Relic wrote that "From the candy-colored cover depicting the three members crowded around a fantasy science project to the uptempo beats and matching fast raps, it's a period piece whose meticulous presentation... make it an enduring pleasure from a bygone era.