It's hard to know how to rate this odd little movie. On one hand, it's dreadful trash that affects to explore the Dracula Mythos while in fact exploiting it at every turn.
On the other hand, this is one of the very few, English-language productions* that addresses the fact that for three centuries, Europe was under attack by an aggressive, expansionist muslim empire. While Western Europe was enjoying the Renaissance, the (mostly) Eastern Orthodox peoples of the Balkans were fighting for their lives against the massive armies of the Ottoman Sultanate. It was their blood and pain that made the Renaissance possible.
Okay, I'll get off my soapbox. As for the "Dark Prince: The True Story of Dracula", I'll go with the majority and rate it a '6'.
* The only other one I can think of offhand is the much higher-budget "Dracula Untold" (2014).