1. D-Sides (2007): This album is a compilation of B-sides and remixes from the band's previous albums. While it contains some interesting and experimental tracks, it is generally seen as lacking the cohesion and quality of their other albums.
2. The Fall (2010): This album was recorded during a lengthy tour, and some critics felt that it suffered from a lack of focus and coherence. It features a more experimental and electronic sound compared to their earlier work, which may not appeal to all listeners.
3. Humanz (2017): While it has its moments, some fans felt that this album lacked the creativity and innovation of previous Gorillaz projects. It features a wide range of guest artists and collaborations, but some critics argued that it resulted in a disjointed and inconsistent sound.
Ultimately, the perception of an album's quality can be subjective, and what one person considers the worst may be another person's favorite. It's always worth giving each album a listen to form your own opinion.