Although not an overall bad experience, I found Castlevania to be a highly disappointing adaptation of the video games, and only mediocre if taken as its own thing.
Pros:
Good voice acting Nicely animated Character designs/locations
Opening credits sequences
Cons:
Lack of creature variety/game enemies
Music/ Lack of Castlevania themes
Unoriginal character arcs/characterization
Lack of villainous presence after Episode 1
Lack of story progression
Dialogue
Cliffhanger ending
Pros:
Good voice acting Nicely animated Character designs/locations
Opening credits sequences
Cons:
Lack of creature variety/game enemies
Music/ Lack of Castlevania themes
Unoriginal character arcs/characterization
Lack of villainous presence after Episode 1
Lack of story progression
Dialogue
Cliffhanger ending