Definition of Real received mixed reviews from music critics who questioned Plies' abilities as a capable rapper.

[1] Khalid Strickland of IGN gave high praise to the album's hyper-violent gangster material for displaying Plies' growth as a rapper, concluding that "Overall, with its bumping production and street sensibility, Definition of Real is a tight-knit piece of work that stiff-arms the dreaded "sophomore slump.

"[5] Patrick Taylor of RapReviews said that despite being a transition to his next album and containing lightweight R&B hits that clashed with his thug image, he praised the album for delivering street tracks that we're interlaced with introspection, concluding that "As it stands, Definition of Real may not be an instant classic, but it isn't a sophomore slump either, and there are signs that there could be more to Plies beyond his drawl and his love of female reproductive organs.

"[2] Jon Caramanica of The New York Times praised Plies for maintaining his charisma when delivering both vindictive vulgarities and conscience sincerity despite the album not being as strong as The Real Testament, saying that it "lacks some of that album's rawness, but is still strong, thanks to his shockingly literal and unforgiving rhymes.

"[9] Roman Cooper of HipHopDX felt the album's production had a cohesive sound but criticized Plies' inability to move past typical gangsta material and into more introspective tracks like "Somebody Loves You" and "1 Day", saying that "Seemingly incapable of switching up his flow or creating vivid imagery, it's important to realize that in listening to Definition of Real, you won't be getting Ready to Die.

"[4] Nathan Slavik of DJBooth was mixed on the album, saying that he was put off by the expletive-laden lyrics heard throughout the hardcore tracks and love songs but that it would attract more to the female demographic.