Stories have an end. Look at any stories that last too long, it almost always end up like shit. Closure is very important in story telling and it's something totally missing in Warcraft, which is very bad because there's quite a lot of content. Which means everything feels like it's getting dragged in the mud and milked like there's no tomorrow. The story should have straight up ended after we killed Arthas in WoW, and then move on to something COMPLETELY different. But no, they just dragged the same shit again and again, inventing random continent that never needed to exist, bringing back villains but making them friends, traveling through time and space and shit. Nah, everything after Arthas is the point of "it's too long now it should have ended".