Is a Wii gun dumb for games where you'll have different types of weapons?

I'm thinking of getting the Nyko Perfect Shot Wii Gun for Resident Evil 5 but I am wondering if it will be dumb for a game like that because a lot of the time you will a gun that is totally different than the what the Perfect Shot gun looks like (e.g. you may be using shotgunds, machine guns etc.)?

Maybe the Wii gun accesories are only good for games where you always have a pistol only in the game.

Any thoughts?

But does anyone find it odd using a pistol shapped gun in a game when they are using a shotgun, flamethrower etc. inside the game?Jason_A

Last time I checked you don't go duck hunting with a pistol either, but that doesn't mean it isn't a fun way to play a game that way?