I only got Castlevania 64, and dispite it's flaws, it's a pretty good game. The camera was a bit whacky, the controls weren't deep enough, but it was still good. It actually got ALOT better the more you progressed.
Lament of Innocence is one of my favorite Castlevania's. The environments keep repeating themselves, though they look alright.The music is awesome. The animation is great, and i found the art direction to be quite good.
Curse of Darkness....meh. It had some really neat features, but got killed by the ugly level design, and completely predictable and liniar gameplay. Combat was cool though.