I for one would much rather use a Wii Mote to play a FPS shooter than use duel analog. If it's done well that is. The reason the Wii doesn't have great FPS's is that there isn't a market for the genre from the system's audiance.
Obviously anyone who is questioning the WiiMote's FPS capability hasn't played Metroid Prime 3; though it isn't a true FPS it feels a lot like one and it controls great.







