I'm someone who gets on Destiny and plays almost every day, I've put plenty of time into Destiny, I love playing the strikes and raids, they have a lot of replayability, but PoE is simply not needed. To start, the rewards are absolute crap. A shitty queens weapon, some motes of light, possibly a strange coin, and a shitty weapon from Variks? Come on. And Prison of Elders itself is so boring and repetitive. I still have so much fun with Crota and VOG 7+ months after they came out, but I haven't even played PoE for over 3 weeks because it's boring and the rewards don't even make the grind worth it.
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PoE is fine the only problem I have with it it's time consuming and the rewards are not worth it. They can fix it by making the chest at Lv35 have equivalent rewards as the flawless ToO chest and you'll see a lot of players coming back to it. That's my take on it.