[Epic.]

Overall based on every series I've seen:

1. BB5 (Nadia, Jason, Shell, Daniel)
2. BB13 (Deana, Adam, Luke A Sara)
3. BB9 (Sara, Mikey, Rachel, Rex)
4. BB7 (Aisleyne, Pete, Glyn, Richard)
5. BB18 (Isabelle, Deborah, Raph, Tom)
6. BB6 (Makosi, Kinga, Anthony, Eugene)
7. BB17 (Hughie, Jason, Andy, Jackson )
8. BB16 (Jack, Chloe, Danny, Joel)
9. BB19 (Cian, Akeem, Cameron, Zoe)
10. BB14 (Gina, Dexter, Jack & Joe, Sam)
11. BB10 (David, Sophie, Charlie, Siavash)
12. BB11 (Josie, Mario, JJ, Dave)

Some crazy stats here. I didn't enjoy BB18 or most of its housemates for that answer, yet I can vouch it had a better set of finalists than BB6, the best series out there. On the opposite end, I really like BB10 but gets second last because of half of the people listed.

BB11 is worst by far, no current civilian series can go lower than that.