I liked Dracula Resurrection. I didn't care for Last Sanctuary so much because I thought the game areas were less interesting. Also Last Sanctuary had all those timed sequences (I got tired of drowning in sewage because I couldn't tell which way was up with that game interface).
I also liked Dracula Resurrection better than Dracula 3: Path of the Dragon. Path of the Dragon almost seems like a different series because of the difference in Dracula. Also, the environments in the first two games may not have been exactly cheery, but the 3rd one was downright oppressive, with a sense of impending doom that never let up.
I liked Dracula Origin a lot more than I expected to. It's sort of "apples and oranges" to compare it with the other 3 Dracula games. Dracula Origin was 3rd person, had a lot more puzzles and Dracula is handsome instead of monstrous in appearance. It's sequel, the casual game Love Kills, was a humorous game that was almost a complete opposite of "Path of the Dragon." If I were to replay any of them, I'd probably choose Dracula Origin.
The new Dracula 4 looks to me like it will have more in common with Dracula 3 than with any of the other games. But the story may be more interesting, so we'll see.