Anduin's character is not believable AND he's kind of a whiny, that's why I dislike him.
Jaina's character is more believable than ever, Arthas, her father, Theramore, her hatred for Garrosh is understandable.
I hope that Characters like Wrathion and Anduin get some interesting plots in Warcraft IV or novels, because in a game like WoW, where it's gameplay>lore, no new characters get the attention they deserve.