I've never played a Castlevania game, would this be a good place to start?
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There's 2 "styles" of Castlevania
ClassicVanias and MetroidVanias.
The former are your hard-as-balls platforming/knockback hack and slash (with a slight exception being Simon's Quest, which is a precursor of sorts to the latter category). It's these games that are in this bundle. Notable omission being Rondo of Blood (the best one).
The latter is still a platformer at its core, but with the ability gating / backtracking and large area map(s) common to the Metroid series. These games started with Symphony of the Night on PS1 and continued into the GBA/NDS era. These games are in the Castlevania Advance Collection and Dominus Collection.
Both styles are very good (who favors which style is personal). Do know that the Castlevania series' music, globally, is GOATed.
Thanks!