I think the only Ferengi that was a well made villain was Bok in "The Battle". The guy they had playing him was phenomenal. Totally worthy of a revisit in 'Bloodlines"
The idea that they made it a Ferengi line of reasoning by having a "life for a life" be a sort of psychotic commerce was brilliant
You can not put a price on life!
Oh, but you can, Picard. You can pay me with your