The reason I put Wrath over BC is because they basically ruined the major characters in BC. Illidan and Kael were the good guys and just used the legion when it suited them but no real allegiance before Blizzard teamed Kael up with KJ permanently and made Illidan go insane. We would probably kill Vashj just because she is a Naga but the other two were sacrificed.
I agree that the Wrath lore ignored Ner'zhul which was bad but the LK character was what you expected him to be after TFT. He wanted to raise up the scourge to defeat the legion because they screwed him over but to do that everyone on Azeroth had to die.