To be honest, that's how I've always felt about previous castlevanias.
Classic ones?: go though each stage, memorize the patterns, kill the boss, repeat till Dracula is banished and watch the castle crumble. For those, only Simons quest, 3, and Dracula x provided some sort of incentive to replay the levels and even then, its only a second time through if your use to thorough examination of levels. 3 had the ability to solo play as each of the four heroes, so there was more replay ability in that.
Igavania: outside of the artificial extension provided by the range of collectables, which honestly have little impact if you pay attention to the subpar combat, had a decent map but once you've completed that, you only had a play through as the bonus character left, and that was just retreading the ground you've already pass through once.
Mercuryvania: the lords of shadow series is essentially quite similar to the igavania games in that, outside of artificially extending the game through (mostly) worthless collectables, all it has is a singleplaythrough.
To me, castlevania simply isn't a series that is replay able constantly. Hell, I like collecting the items and even I can realize how its used to artificially expand the time. Once you've collected them all and 100% the game, the modern castlevanias really don't have anything else, like their predecessors, to immediately make one think "let's go through that again!"
Compare their replay ability to something like bayonetta or metal gear rising: in those games, the gameplay is so finely tuned that you can spend hours uncovering new moves, techniques, etc. not to mention, they are always a blast to play through and their combat doesn't suffer like castlevania does in certain games.
Or, if you'd like a better example: silent hill. One play through, you've merely scratched the surface of the depth in the game. Silent hill provides hours of examination into its themes, character motivations, and psychological horror/thriller motives. Heck, the other day, while playing 2 and having the town in the otherworld, I recognized that the lake had turned into a concrete lake. All the subtle nuances really add to the silent hill experience.
Point is: to me, castlevania is best seen as a "experience is, absorb it, finish it, forget, and come back later when the memories are murky" type of game. To be fair though, a good bit of games are as well...