I guess you never played against a Rogue with both warglaives if you think they weren't broken. The reason it didn't seem as broken to you was because not every single Rogue and Hunter ran around with the legendaries, maybe only a couple existed among your entire battlegroup. In Wotlk every Warrior, DK and Ret ran around with Shadowmourne but I wouldn't say it was more broken.
I agree with this, in my mental classification I too see Cata as the beginning of the end, where from Vanilla to Wotlk it all was upwards (with some up and downs mind you), it was only downhill from Cata. However if you ignore the past and look at Cata objectively, it wasn't that bad of an expansion (although I stopped playing the game for the first time at the start of S11). Unlike MoP, WoD and Legion which were honestly unplayable.
I have. And I didnt say glaives werent broken i said they werent as broken. As in, yes it gave the rogue an edge but it didnt let me instantly climb to glad because they got them. It just gave them more haste and hit a little bit harder it really wasnt THAT glaring of an issue.
Whereas shadowmourne literally gave anyone with them gladiator. On my server there were 4 or 5 people who got shadowmourne that i can remember and every single one of them went from 1400-1700 to gladiator in one season. Some ran 5s with double mourne some ran double healer with mourne dk. It was fucking atrocious. Double glaives never did that or even came close to that lets be honest here