Depends on what you are into. As a longtime ladder/singleplayer D2 player (many years now), playing D3 felt like Blizzard was giving ME the middle finger. I dislike almost everything they have done with the game. It is much worse than mediocre.
POE is rough around the edges, no doubt, but I love the new mechanics it introduced. I agree with the poster that said "D2 is better," but I think POE is new and refreshing in the ways the genre needs. Flasks are unique items? Skills are handled like FF7 materia? MEGA HUGE passive skill tree? Love it. I really hope the AAA devs take notice of how much attention this game gets and give the ARPG genre a reboot worthy of $60 and years of play. Get creative. Make some awesome game changing items. Have fantastic random map generation. Make the combat feel great. Allow creative builds. Encourage multiple characters. Cmon ARPG devs. Hire me for Jay Wilsons old job, I'll turn the game on its head!