Yeah BB pirates are pretty meh outside of Kuzan right now, but beast pirates were fun during Onigashima.
King - Sure had little to no personality, but he was a good foil to Zoro because he and King made the same promise to their captain, to never lose. However, it led to Zoro winning because unlike King, Zoro had his own ambition which helped him unlock his CoC.
Queen - Had a lot of personality and was honestly the most fun part of act 2 to read. And like King was a good foil to Sanji where Queen was basically what Sanji could’ve been without his mother saving Sanjis emotions allowing him to control his transformation and bring out his hotter fire.
Combine these two with Ulti and Apoo and I liked the Beast Pirates a lot more than BMP.