It's not that nobody plays it, it's just that it doesn't have much replay value. To get the fullest out of it, you only have to play it nine times, three times per tier. This is all that's required to get a Seerus mask, be it fractured, flawed, or perfect. It's not a very fun place to be and the loot yield isn't all that great, which is why people don't play it often. As for the mission rewards, if you aren't afraid to spend some money to get some weapons, they're worth it. The Rocket Hammer is powerful, especially towards stationary targets, but requires skill to use without endangering yourself. The Dark Reprisal/Retribution is a solid bomb that does a number on gremlins and slimes, but slimes especially. The Seerus masks are great gunner masks with fire and shock defense and make a decent costume.

If you want someone to play it with you, I'd be up for it whenever. My in-game name is Dementia-Praecox, same as my forum one.

I feel OCH is worth it for the experience alone. It's a nice series of levels to experience once or twice, but not grind. The weapons are great too, and I feel those alone also make it worthwhile from an economic standpoint.

I did it a week ago. because it hit me. the OCH mask is a costume piece (for me) and with no CE cost i can just make it and have no need to heat it. and no 4* item to craft upwards

I have all three masks crafted, but I still replay it every once in a while as a nice change of pace, especially now with the energy costs removed. I still need to run T2 and T3 on Elite to get those shiny gold badges.