I'd probably rather just stick with the Wiimote + nunchuck combo myself instead of the Wii Zapper plus screen. Although this control scheme looks pretty nice in it's own right. I just prefer to have the nunchuck to my side while aiming the Wiimote at the screen.

I've never had a problem with a controller to be honest. With analog sticks I can keep up with people playing using a mouse pretty well.

The best combo though would be a mouse for aiming and analog with buttons for moving and other actions.

dual analog is easy enough.

You're just accustomed to it. But if you're saying its easy because it requires the least physical effort/activity, then yes it is.

Mouse & keyboard forever.

I sure hope it isnt, I'll stick to my Dual analog and M/K setups

With auto aim, aim assist, etc... To be honest aiming in FPS has become pretty bland and boring when it comes to regular controllers with all the features that pretty much help lower ability players compensate for their lack of skill. 

Not as accurate as a mouse, but certainly more immersive.

Grandma would still have to use that analog stick to walk around or something when playing anything else than a railshooter

Inferior in aiming, not moving in a 3D environment.