There was a vast difference between the early days and the end days of Vanilla.
Nathanos was difficult early on. People were just learning the game, and everyone still had crap gear. It easily took a raid group (and then some) to bring him down.
By the end of Vanilla, we all had stupidly good gear, and he was easy. I soloed him in full GM gear. Vanilla was way more gear dependant than anything after.
Instead of calling people liars, maybe acknowledge that people will REMEMBER the fight differently, because THEIR experiences were different from yours.
Now on topic… I think we’ll just have to wait and see about numbers. Maybe they still need a little tweeking. I’ve seen other posts about mobs being much too easy to drop. People who have screen shots of combat from Vanilla, who have compared the exact same mobs in the beta are finding the damage and health really low.