I dislike CoD mostly because of how much potential it had. It could've been an awesome Simon's Quest in 3D with interesting environments and level design. I did like the ability to level up like in the Metroidvanias, and I absolutely A D O R E the soundtrack. It's just so beautiful I can't even begin to describe how much I love it.
Rest of the game was excruciatingly boring and the drawn out levels made the game feel much longer than it really was. Also, Hector is very slow. Or maybe the stages are too big. Anyhow the game moved at a snails pace. Graphically, CoD is strangely enough a step down from Lament of Innocence. I have no idea what happened here. Maybe it has something to do with the fixed camera in LoI?
Now, I don't mind outdated visuals if the game was fun, but the level design is so lazy I don't know if I've seen anything quite like it on the PS2, especially not for a game of CoDs size. At least LoI's samey levels were pretty to look at.
Conclusion: CoD is worth playing if only for the music, but I'd rather just listen to OST. I sincerely hope someone (IGA?) can make a 3D RPG style Castlevania work in the future. There's SO much potential here.