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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Prison of Elders is not just boring and useless, it's not welcoming anyone who has limited time to play and doesn't want to meet weird people on the web. Level 28 is useless, it gives nothing. Levels 32, 34 and 35 don't have matchmaking, and so, while Prison of Elders is extremely boring, it's not even an option for most gamers.