There hasn't been an encounter in WoW, until Jaina, that I've felt the game accurately showed off how incredibly powerful some of the characters are. Garrosh specifically really disappointed me (Even though I like his fight) with how much he had to rely on so much outside help
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That felt like a bit of power creep misuse on Blizzard's part. Garrosh needs a ton of help in his raid fight but we need Thrall to help us beat in him in WoD.
I mean they've admitted they screwed the pooch countless times with Garrosh sadly. But I do think for once they did him well in Warlords of Draenor. The emotion in Thrall vs Garrosh still sits with me today as both one of the greatest fights and conclusion to their arcs.