As much as I love the game, it's impossible to ignore every fault, and hoo boy, the game has plenty of them.
The plot feels rather like Iga and his team took every unused Castlevania plot device since Symphony, slathered some glue on them, and flung them from a bucket onto a storyboard.
The Dynasty Warriors combat was DREADFUL. It's easily the worst attempt at 3D combat in the series.
"PRESS THESE TWO BUTTONS OVER AND OVER AGAIN TO WIN."
Real smooth, Konami.
"Oh, and there may be some blocking and dodging involved."
Thanks for the brilliant gameplay.
That said, the game has some pretty tight boss battles, with Isaac, Trevor, and surprisingly Dracula all offering amazing boss entries in the series, but that doesn't stop Hector/Trevor's very limited movesets from growing endlessly stale.
The stages are dull, tedious, and invariably boring, though there is room for some occasional pretty; as often as Garibaldi Cathedral is talked about, the Abandoned Castle at the beginning left a very strong impression on me.
The music is all around great, with the sole exception of the Infinite Corridor, where the music is more tedious than the stage. But that dud aside, it's my top Castlevania soundtrack of all time. I wish I could use it for Lords of Shadow; it would have made it a much better game.
The voice acting also tends towards the strong side, with Hector, Isaac, Zead, Saint Germaine, and Dracula all having top notch performances. I wish Julia and Trevor's voices packed a bit more dramatic OOMPH, especially Julia's.
I guess what I'm trying to say is that this game's strength lies more or less entirely in its presentation, rather than the gameplay itself. The music, voices, and art all amaze all these years later, but the game itself is sadly beneath the other 3D titles, especially Lords, which is basically Curse's opposite: while Curse looks the part but flops in the gameplay department, Lords plays great, but doesn't look at all like a Castlevania should.
Curse got half the formula right, but getting half the recipe right still results in a crappy cake.
That said, I still love the game for the half it gets right. So, woohoo!