Derek Branning: just utterly awful in every way. His presence made the show unwatchable for months on end.
Joey Branning: Paper-thin 'character' and the actor was embarrassingly bad. Couldn't understand what he was saying half the time.
Tyler/Anthony Moon: the 'new Mitchell brothers' apparently

Cringiest characters ever.
Ava Hartman: complete mess of a character, her backstory changed on a weekly basis.
Dexter Hartman: So. Annoying.
The Hartman father: can't even remember his name he was that bad. The Hartman family were the biggest flop the show has ever seen.
Gavin Sullivan: oh boy, they messed this one up big time. About as threatening as a garden gnome.