1) Darkcoin's certain future failure is by it's instamine, of which it would never get over(Too much evidence showing that it was intended, and yes everything has been screenshotted in reference to the instamine, so no point in refuting the acknowledgement that it was most likely deliberate)

2) Darkcoin's parameters have been messed with, which goes against the point of cryptocurrencies. For example: Darkcoin's(now renamed Dash) max coin supply was cut by more than 50%, while also having it's block reward cut by more than 100%, all within the first week of Darkcoin's existence. This goes to show that this "currency" is not decentralized, as it has already been highly tampered with by it's developer.

3) Darkcoin's masternodes is a centralization risk. Masternodes run on servers, servers are centralized, meaning masternodes are centralized and are a risk to the network. Even if masternodes are kept offline, there's an even higher chance of losing the masternode due to human error, accident, etc.

and many more.