The current talent system
AKA the only thing I really disliked about MoP. Hey, we threw out the old talent system because there was a "correct way" to allocate talent points and we want to avoid that. Well news flash. That's still a thing. Also we don't get talents at the same intervals. For non hero classes it's mostly every 15 levels with the last comming after 10. But for Death Knights it is a total clusterfuck. 56, 57, 58, 60, 75, 90, 100. Let's try again, shall we? Or if they really don't want correct and incorrect ways, let's just forget about talents.