[Oaker]

BB16, because;

-The worst twist in Big Brother history happens on Day 18 which completely ruins the flow of the series and puts an end to what where actually a really good first 2 weeks.
-Marc was in the series.
-The "BB Legends" come in and completely overtake the series, making the original cast background characters for 2 weeks (even worse is the fact that they were originally only meant to be there for 1 week but the producers extended it so they could put Aisleyne in).
-Once Helen/Nikki leave the following week is basically just Marc vs Aisleyne every day over and over again.
-There were four rounds of nominations total. 2 of those were face-to-face, 1 was for a fake eviction, and another was reversed.
-The nomination twists were somehow worse than BB15's which stupid stuff like Nominations tag and having to run to a button the fastest to nominate...
-It was the 6th series in 2 years to have a fake eviction, which made the fake eviction completely pointless since everyone knew it was fake because of how often the twist was used.
-The male cast was one of the worst ever. The best male was Simon which really says something about the quality.
-The series basically reset 3 times (Post 4in4out, legends week, post-Marc) which meant there were hardly any consistent or interesting storylines.
-The trend of ejections for attention started here.
-The twist at the final double was one of the worst ever and completely unfair to whoever was evicted, didn't help that it happened to be one of the better ones left.

There's probably more things but it's 1am and I wrote this all on the spot and from memory so