Here, I'll be Devil's Advocate: Saying it "reached it's peak" during Wrath is ONLY factual based on sub numbers, it has NOTHING to do with how long-term players actually felt about the game. That's subjective at all times, because simply put: It's a matter of opinion.
Doesn't matter what you or I think, everyone has their own feelings on it, so making claims as if they are fact is just silly and blatant hypothesizing AT BEST.