One of the best SEQUELS I've ever seen
I watched (again) the first and the second parts of the Blade series. I think the second part has many similarites with the first part, but it mixes them to be different enough, let me clarify (spoilers ahead):
1. In the first part, Dragonetti suffers a painful death by being exposed to the sun light, one of the ugliest moments in the movie. In the second part, Nyssa also dies in the sun light, but here the death represents farewells, and the death is shown to be pain relieving, rather than the death of Dragonetti seen in the first part.
2. The first part shows Blade in anger, after he realizes who was the vampire that made him what he is. He yells the name of "Frost", during the fight of Frost's people. In the second part, Nomak yells "father" in anger, and fights against his father's security only to get his hands on his father.
3. Somehow the character "Rush" reminds me of "Quinn" from the first part. Although their roles are a bit different, they seem to represent same kind of threat to Blade, that is easily dealt with but has similarities in the humour side of these characters.
4. We have another rave scene in the sequel, but again it works very well here carrying the action forward.
5. Blade safes (kind of) Whistler in the both movies. In the first one, he shots him so that he doesn't have to suffer anymore after the beating. In the second one, he manages to return him back to human. This somehow co-works also with the scenario, on what happened when Whistler first met Blade and taught him how to survive.
What i'm trying to say, is that the makers of the sequel very well have knowledged what made the first part good, and used it in the second one making it a damn good movie. There surely are many other "connections" between these movies, those listed above are the ones I happen to remember. Add the hideous reaper vampires, The Bloodback, new weapons and lots of action and you have a winner here. Overall, to me, Blade II is a very fine example of how good sequels are made!