GMB received favorable reviews from contemporary music critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album received an average score of 74, which indicates "generally favorable reviews", based on four reviews. Okayplayer's Rachel Greenberg gave the album an 89 out of 100, saying: "GMB is Pac Div's best and most consistent work to date. The production knocks and Like, Mibbs, and BeYoung are more proficient at killing sh-t on the regular than Rick Grimes, with nary a weak link to be found. The best way to describe Pac Div is fact is to say they're an Okayplayer-y version of Tha Dogg Pound; more lyrical, less gangsta, but with a comparable degree of charisma, trunk-rattling bass and skirt chasing. This is their Dogg Food." HipHopDX reviewer Edwin Ortiz gave the album a 3.5 out of five, saying: "Despite its missteps, GMB is a commendable project that should hold over diehard fans. More so than anything else though, it's proof that the independent route was the right choice for Pac Div." David Reyneke of Potholes In My Blog also gave the album a 3.5 out of five, saying: "GMB is by no means a hip-hop game breaker, but it does prove that Pac Div is worth every bit of the hype that has been tossed around for nearly five years now." In a mixed review, XXL reviewer Bogar Alonso gave the album an "L", saying: "Pac Div was hoping to achieve a harder sound with GMB, and when it comes to the tongue-in-cheek “Bank,” “Sneakerboxes,” which features Chip Gnarly & Big Silk, and “Debo,” they certainly get there. But it is when they take a more casual approach to their sound, as on “Slow,” which sounds like a club anthem lost at a children's party, or the aimlessly catchy “Can't Help It,” that they reach heights only attained by Superman. On “No Superman,” they joke that they get confused for a member of Da Bush Babees, which might not be too far off considering how much “It's All Love,” seems like a Native Tongues throwback. It also might be one of the strongest tracks of 2012. At 17-strong, and with limitless cross-over appeal, Pac Div will still get hip-hop fans across the hip-hop spectrum to “want that GMB.”" Jon Hadusek of Consequence of Sound gave the album three out of five stars, saying: GMB is a relaxed, enjoyable rap record by three dudes who have fun rhyming words together. Maybe it'll break, maybe it won't. As illustrated by “Bank,” there's a bitterness brewing; for Pac Div’s sake, let's hope it never overtakes their earnestness."
Track listing
;Sample credits
"Can't Help It" contains a sample of "I'll Never Let You Go" as performed by The Sylvers.
"Fuck Y'all" contains a sample of "Tetris" as performed by DJ Dahi.
"Debo" contains a sample of "Bounce" as performed by Timbaland.
