As movie spin-offs go, Blade shows promise, but it does have a proving ground to cover first. The lead actor, Kirk Jones (or "Sticky Fingaz," as he is credited), was a bit wooden in much of his delivery, but did an overall passable job. In order to carry the show, he will need to become much more comfortable in his role. His assistant has very little backstory available, though that may very well change as the show progresses.
However, the vampires are ready and set. With a cast that, amusingly enough, is pilfered from various "Stargate: SG-1" episodes, the vampire clan is interesting and presents a truly engaging enemy for Blade to fight. Marcus Van Sciver, played by Neil Jackson, is a fun mix of evil vampire and capable clan-leader. The various jockeyings for position amongst the members of the clan open up a lot of avenues for great story lines, especially when played against the loyalty to Marcus displayed by vampires like Fritz. Krista's conflict as a new vampire in the middle of an old fight is genuinely intriguing.
Overall, the show is worth watching, at least to get a feel for where it may go from here. It isn't spectacular, and it may never get there, but it doesn't crash and burn right at the outset, either, and it certainly shows a lot of good potential.