I once badmouthed
CotM as frustrating and inferior to the other GBA entries,
Aria and
Harmony. About a month ago, I somehow ended up reading some reviews on the game, and I was puzzled by all the praise. So I tried it again, and stuck to it through the early frustrations. OMG! It opened up into a terrific experience. The amount of depth and replay in this game is unreal. I've been in it ever since, and just tonight finished the last mode. There are 5: vampire killer (default), magician, fighter, shooter and thief.
The vampire killer has balanced stats. The magician starts out with all the DSS cards and has a big intelligence boost to the other lowered stats. The fighter has a lot of strength and defense, but no magic at all. The shooter has a lot of subweapon hearts and power, but is crappy otherwise. He also gets a unique homing knife that even does loops onscreen in search of a target. The thief has ridiculously high luck and is otherwise weak. Magician, fighter and thief are a lot of fun, because their high strength in one area can be exploited to great advantage. These 3 play in very different ways. The shooter is too much work, because his subweapon prowess doesn't seem to make up for being so weak in every respect. He's the only one I didn't much enjoy.
The original mode is fine too. I learned all about the magic system then, and how well it works. But it wasn't until the thief and his ability to get every single item drop that I realized how much stuff there is to find in the game. So in short, I regret not giving
CotM the chance it deserved originally. It's a beautiful, huge, and absolutely addicting game. And I missed
the great music too. It's the only GBA Castlevania that has music of this caliber.