It's the bane of trying to please WoW players. If you release it all at once, everyone plays it until their eyes bleed and say "I've done this, now where's my new content?!". If you time gate it everyone plays what you have and say "I've done this, now where's my new content?". The second option at least lets you have something new each week, which no matter how much you dislike it most likely will make you play the game longer. This is not a sinister choice at all, it's just the right choice from a design point of view.
If you disagree with this you're obviously entitled to your opinion, but you're quite frankly wrong.
At the time of writing this, only 23.68% of the poll voters have a negative opinion about Torghast. More voters have a positive opinion than a neutral opinion. I think it'll end up being more fun the higher we go, but I wish my main's priest powers would even come close to how fun and how strong my alt's shaman powers are. Kudos to the Torghast shaman designers, get back to work Torghast priest designers!