Yet there's still 2D games that suffer from BAD slowdown (see Odin Sphere), which in some instances can be even worse than poor control. As for the #d Castlevanias (or any series that has transitioned over to 3D) of course they'll control differently than their 2D precusors. Fun factor attached to that is purely opinion. You are very right in the fact that some series have made anywhere from an ok, to awful transition from 2D to 3D, but many have done great (Mario Galaxy, etc.).