I didn't like them because we didn't get the Elan, Maenads, Dromites, Xephs or even Synad from 3.5e as races and instead got crystal people. Yes I know that Elan was some sort of paragon path in 4e, and would definitely be a Lineage like Dhampir or Reborn in 5e. That Maenad, Xephs and Synad are already very Human-like. Except for the rage-thing the Maenad has very little to do with the ones in Greek mythology. Xephs probably aren't too different from Githzerai all things considered. The three-in-one mind Synad might be an evolved form of the 1e monster the Tirapheg, they might be more suitable as some subclass or background. And the Dromites are some weird Bug-Halfling people.