For someone who played D2 and D3 for thousands of hours, D4 typically comes off as really awful. The accessibility tradeoff means that the cheesy (and enjoyable) strategies you used to enjoy in former iterations are no longer feasible because the auto adapting numerical difficulty system is so aggressively casual. Every time you get a big piece of gear, it is watered down to pointlessness immediately. D3 and D2 do not have this problem, but their difficulty curves are more discrete and unforgiving in many areas.