Not going to quote those fact-less long posts above me so i will just answer generally.
What i say its what it was going on during those time.
Tbc pinnacle of wow time ? Maybe during tbc yes, then wotlk came.
A shit load of people complained about arena and pvp unbalanced during tbc ( ask any serious pvper ). Seem you didnt play it so you cant remember the unkillable druids healers and many other fotm classes.
And no i am no belial, i just say what the truth is.
I know you guys like to think that tbc was all happiness and rainbows .. but truth is another.
And those i linked are a short amount of complains during tbc, i could list a longer list if i wanted.
So yeah , tbc was as hated if not more than wotlk ( as current ).
Time made it seem better because of the reasons i listed .