I've had this for a while, but only recently realised how wonky the controls are. Does anyone know why? To explain, if you are in the Wii's menu, the pointer is pretty accurate (hold it right up to your eye and point wherever, and that's pretty much where the cursor points). And when you go into House of the Dead, that's the case for the first few menus. But once you get into the game, it's all over the place. The cursor accelerates exponentially up the screen. How did the developer turn something that was pretty accurate into something so woeful?
The standard Wii library for pointer/WiiMote stuff is pretty awful. Horrid acceleration, loses accuracy in the corners - just crap. To be fair, it's designed to make the WiiMote feel better for pointer movement rather than absolute accuracy.
SEGA wrote their own pointer stuff for a few games - notably "House of the Dead 2 & 3 Return" and "Ghost Squad" (I recall reading an interview with the developers on these porting projects to Wii specifically, and the fact that they threw out the provided WiiMote code in favour of their own for this very reason). Play those games compared to other non-SEGA gun games, and the lightgun movement is fantastic (good enough to turn the cursor off).
HotD Overkill went back to the Wii's provided libraries. Add to that the fact that the Wii really struggles with this game (frame rate drops all over the place), and it's a shocker by comparison. I consider it a party game at best, and just avoid it if I'm in the mood for actual light-gun gaming.
I'm not sure about the "Gunblade NY / LA Machine Guns" port on Wii. I own it, but haven't played it since purchase to compare. I'm assuming since it's AM2 porting, they'd use the same good quality pointer code that was used in the earlier HotD games and Ghost Squad.