I still think Louisa and series 12 was the worst series ever as all she did was shout, and you was made to feel like a bad person for not supporting her by the show, they even gave her angel wings in one of her performances, she really killed that series imo, and Che being such a dud at the lives and then taking third place didn't help either, even though I know that he was a victim himself.
Besides the Fleur fiasco I think that series 11 was a step in the right direction out of the modern X Factor's as Andrea was more like Saara than he was a Sam Bailey on the Diva singing instead of shouting, Lauren offered a good style of Pop and pulled it off alot better than Emily in this series imo, and some of the acts that went early had decent voices and could've been really good if given the right material like Paul Akister and Jack Walton.
Series 12 and 13 didn't follow the series 11 system which I think has hurt them imo, Series 13 has had a few decent singers at the lives, but overall they were completely mismanaged (even Saara had some terrible song choices)