The drops looked cool but weren't that useful, even for the Raid they're only a small margin better than most. Also the drop rates were shit and there wasn't a Challenge Mode at first, which meant there were less drops overall to begin with. Oh and because it took the most time and most strats are very linear, there is no 'alternate method.' Also because LFG requirements like Spindle and Sleeper Simulant* for War Priest and Golgoroth, and Touch of Malice for Daughters and Oryx chased away the majority of casuals. Lots of good reasons. It had the best thematic design, the best terrain textures, the best aesthetics for rewards . . . But it lacked one vital aspect: Accessibility.