Yes, I believe so. Despite getting a few details wrong (the documentary says his "forest of death" consisted of ten thousand impaled bodies, when it was actually twenty) and for whatever reason waiting until late in the episode to name certain things (i.e. mentioning Poenari a bunch of times before actually saying its name, referring to Radu only as "Dracula's brother," constantly calling Vlad "Dracula" to really make sure we know his connection to the vampire, etc.), it's a pretty accurate and in-depth coverage of the guy.
I personally would have liked to hear the Romanian equivalent of his famous nickname - Kazikli Bey - come up, one for accuracy and two just so I wasn't hearing "Vlad the Impaler" and "Impaler Prince" every few sentences, but it's a good documentary.