I love Death in Dawn of Sorrow, not too easy, not too hard, but so awesome.
In Circle of the Moon he was pretty difficult.
In Portrain of Ruin he was only difficult on the level cap modes.
In Harmony of Dissonance/Symphony of the Night he was a pussy.
In Aria of Sorrow he was about the same as DoS, but less awesome.
People say that the hardest Death battle is in the original Castlevania on the NES though. Is his pattern that hard to memorize in it?
What about Death in Lament of Innocence, or for that matter any other Castlevania game, is he any worthy of a difficult fight?
Out of the bosses I have fought, I would have to consider that Dracula from Circle of the Moon is the hardest boss for me so far.