I don't understand what people are complaining about here.
I am mining Unobtanium (UNO) at GM. I am also mining it on my local mining gear with miningpools.co. The two are pretty much on parallel, with GM slightly exceeding miningpools.co in terms of payout. But pretty much the same.
So you're complaining about ROI?
Have you considered the possibility that it's mining whatever particular coin you've chosen?
I agree. I've allocated some hash power over to Darkcoin on the off chance it makes a rebound. When I bough into GM I knew there was a fair chance I'd never see my investment returned in full, but mining is a gamblers game anyways.