This is so true and it's sad to see how many on here are like that.
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MoP was far from it's peak, end of WOTLK. Cata damaged the game and MoP had a horrible reputation yet the game was stable around 8M players for a whole year. It showed how good it still was. The core of the game ended after MoP and we got 2.0 WoW since then which been on massive spiral downwards faster then ever.
I blame sharding for many of it's issues.
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Did you even play the game at all? 40 man raids was SOOOO common back in the days and no you would not lag out, you are clearly lying.