Problem with FATES at 51+ is unlike the ones before 50 the mobs still have too much HP. The exp/effort is too high in general past 50 because they made the mobs in general too hard. They thought that making the mobs harder to kill would be more of a challenge but they didn't increase the exp to match. They're not so much hard just more annoying its the same with the 51+ dungeons as well. Pre-50 dungeons would give the best part of a level if you were levelling an alt but the 51+ ones give little more than a 1/4 of a level at best. Levelling needs to be more balanced out and I hope 3.1 comes with some fixes for that.