DATACOIN is fork of Primecoin, and as is DATACOIN has same "problems" as Primecoin. Algo like that has probably never been written for such big difficulty. Algo spec is 60 block per hours, so one block per minute. When in DATACOIN network only small rig with 5-6Khash start to mining, difficulty will start to rise . But when that rig left network, then problem is big: difficulty DOESNOT fall as was rise. And that is situation we have now. Difficulty is to high for this hash rate of whole network, and probably will need one or two months to get stable, to stabilize on 60 blocks per hour. That is main, and only problem this algo have. Could be fixed, I dont know, but it should be fixed