The biggest outcries actually happened in Wrath. Each patch was considered the doom of WoW, RealID caused a huge outcry (this one made sense though), but the biggest thing was probably the badge system where people were QQing that "everyone" could get T10 in no time
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Thank god you aren't working for blizz. They may buff/tune them a bit, but gameplay-wise they have been the best this way... since ever