Some issues I see with DRK.  tl;dr at bottom

Assuming the coin anonymity feature stands the test of time, most people are still showing their hand in other ways.  Just by posting on this forum for instance.  Eventually someone will be brought up on charges by the IRS of tax evasion because the government has a backdoor to everything.  They are probably busy setting up a masternode right now.  And they will catch some drug dealers as well just like Silk Road, everyone was so sure it was secure because maths.  

Then there is the issue of mining.  Everyone knows the mining kernel is not optimized and some people have private miners that do 50% to 300% better than stock.  This is MUCH worse than the "random" rewards problem with DOGE that were not random at all.  People would refuse to mine random rewards coins yet this is many times the magnitude of that problem.  Here is a miner that does 40% better than stock:

https://bitcointalk.org/index.php?topic=616786.0

Yeah he is in violation of the GPL but he has 30 days to comply in which time he will rack up quite the stash since he is skimming 2% of the hash.  And this is the public version.  Private versions go much further.

tl:dr
1. the privacy won't last
2. the mining is grossly unfair

Recommendation:  All the alt coins that were sold off recently are a screaming buy now and DRK is due a correction.