These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: The vampire leader Deacon Frost from the first movie is the worst villain in a setting filled with sadistic predators who kill humans as much for fun as for sustenance. Unlike the older vampire hierarchy who prefer to remain in the shadows and rule humanity behind the scenes to protect their interests, he wants to openly reduce all humans to cattle despite originally having been one himself instead of a vampire pureblood. He murders a vampire elder in an exceptionally painful way by removing his teeth and letting him burn up in the sunrise, and kills all the other council members to complete a ritual sacrifice so he can rule supreme as a Physical God. He murders his human minions whenever he likes, attacks Blade's mentor Whistler and then leaves him to die slowly, tries to feed a woman to a ghoul-type zombie, and tries to kill a little girl in front of Blade by first threatening to slit her throat and then throwing her in front of city traffic to make his escape. His worst crime isn't revealed until the end of the film, when Blade discovers that Frost was the vampire who attacked his pregnant human mother and turned Blade into a Dhampyr to begin with. Frost fully intended the unborn child to die and since then has kept Blade's mother as his private consort and facilitated her corruption into a remorseless monster.
Narm: "Motherfucka, you outta ya damn mind?!" Blade is pretty stoic throughout the whole film, with a dry sense of humour, and to see him quip that line in a stereotypical "annoyed ghetto black man" voice is hilariously out of place.
Blade: "Some mothafuckas are always trying to iceskate uphill."
It makes perfect sense. It's something that can work for about a second, and then failure. Frost just can't do what is impossible.
Strawman Has a Point: Frost says humans are like cattle, so Blade shouldn't care about saving them. Thing is, with all the examples of Apathetic Citizens we see in the film, it's hard not to concede that he has a point in-universe.
Tear Jerker: Whistler's honorable suicide in the first film, subverted by the second, which retconned it.
Visual Effects of Awesome: When the first film was released the vampire's being "ashed" was amazing for its day. And even a decade on is still pretty cool. The effect noticeably improved with subsequent sequels.