I think it's great from a lore perspective. I have mixed feelings about Garrosh's character arc as a whole, but dethroning him and creating a new direction for the Horde is definitely a good move at this point. And a final raid in which one faction rebels against its leader and the other faction besieges its enemy's capital? How is that not awesome lore?
No, you aren't the only one. Lots of other people are wrong too.
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Which faction are you a part of? LOL, no way to even tell from your post.
I play both sides and they've both had great lore in MoP.
<- Also a lore nerd. I think the lore we're getting now is leagues ahead of say, Vanilla where faction leaders were mute or missing and all players did was fight bugs and big fire elementals (who had heretofore never existed). And TBC where Illidan and KT got reduced to bad guys to kill for lewt.
Not to say Vanilla and TBC didn't also have some great lore, eg the Tirion Fordring chain and the Mag'har quest chain. But so much more happens in game these days - shit more big events happened in the 5.1 storyline quests than all of Vanilla and TBC combined.