The song received generally positive reviews.
Billboard's Carl Lamarre ranked it as the eighth best song from
The Fall-Off, commenting that J. Cole's "wordplay reaches a fever pitch". He additionally wrote, "Undeterred, Cole excavates through the track with relative ease, flexing his dexterity like a first-ballot
Hall of Famer."
Consequence's Kiana Fitzgerald described the song as "dense, bass-indebted" and that it "bring[s] forth the animated J. Cole who's worthy of the Big 3 status." Reviewing
The Fall-Off for
Rolling Stone, Mosi Reeves wrote "The music often descends into a pleasant muddle, populated by tasteful notes made famous by others, yet enlivened by sharp bars such as 'I blaze by graveyards and destitute economies/Full of thug bones for refusin' to move in harmony' on 'Who TF Iz U.'"
Pitchfork's Benny Sun had a more mixed reaction to the song, noting that its interpolation of "Some Cut" was already used in the song "
What It Is (Block Boy)" by
Doechii. He still considered it a strong song, but one that "do[es] little to quell the narrative that J. Cole has been a step behind his peers for a while now." William Rosebury of
The Line of Best Fit considered the song within the "most accomplished run on the album", particularly complimenting its "
braggadocious bars". Reviewing the album for
Exclaim!, Vernon Ayiku praised J. Cole for displaying his "sharpest lyrical precision to date", writing "The rhyme schemes are tighter and more intricate, particularly on the first verse of 'Who TF Iz U,' where he layers dense, multi-syllabic patterns without sacrificing clarity or focus." ==Charts==