Lol. Garrosh was the fucking instigator of the shitshow, not some shining example. It has just continued since him, because Blizzard are incapable of writing coherent larger-scale lore.
As for what's stupidest, I can't really decide. Orc worship, Sylvanas worship, or just the continued, utter failure to tap into any of the potential of the night elves over time. 9 times out of 10, when they do anything at all with a night elf, story wise, I just want to crawl into a fucking hole. The 8.1 cinematic, with Malfurion taking on that Horde supply train, was like a single candle in a storm. I can barely even summon the vitriol I used to have, anymore. Repeated disappointment eventually leads to apathy.