Best and Worst Brands for Quality in 2023 According to J.D. Power Published on June 22, 2023 in Top 10 by The Car Guide Photo: Polestar (Worst brands) 1. Polestar - 313 problems per 100 vehicles Note: Polestar is included in the industry average, but because the brand does not meet study award critera, it can’t be officially ranked.