The series is basically a continuation from where the Blade films left off. After the death of Whistler Blade has new allies in the form of Shen and later Christa, who both help him to fight the vampire house of Chthon. A good thing about the series is they occasionally use clips from the films especially showing Blade's mother. The series also shows us about Blade's origins, his gang past and how he met Whistler and why he started fighting vampire's in the first place. There are also some refernces to the rest of the Marvel comic universe. The series still has the vampire killing, emotion and humour that we saw in the films and delves deeper in to who Blade is.
The series pilot had millions of viewers, but the series finished simply because the production company, Spike TV, ran out of money as Blade was it's first production and therefore the show did not finish due to bad ratings.
It is well worth watching if you love the Blade films and comics or just like vampires, violence and a bit of cool music.