User blog comment:TomWelling/How is that possible?/@comment-176.249.115.102-20121211175537/@comment-5674726-20121211225526

That, or they realised that they'd made him too good a King.

Aside from his blanket persecution of those with magic, which ended up having Morgana-shaped consequences that broke his heart and his spirit, I wouldn't consider him a bad ruler. The people of Camelot seem to have been more prosperous than those in Ealdor, for example. He was able to bring peace to Camelot, and to forge peace between the Five Kingdoms. I'd say that he did more to create a peaceful Albion than Arthur has, which was probably the problem.