The dash in the D could lead to confusion with Dogecoin, which is much larger and has been using it longer. Also, a metallic look is nice during a one-time side-by-side comparison, but for something ubiquitous that you see over and over again, you want something flatter and more cartoony like LTC's logo.
+1
You raise fair points. IMO we really need a graphic designer who knows their shit to decide on a set of official graphics. Branding & logo design has a lot of intricacies and it's easy to make mistakes if you're not in the biz. Having said that, the crypto world moves fast and it's not unusual to rebrand down the track. Still early days for DarkCoin.
I'm not sure the D would be confused for doge given the colouring, but considering the official dodge symbol is Ð, it might be good to avoid making the DRK logo look too similar.