I still don't think move will be the best in fps games. For example, the frag-fx, allows you to both aim and use the face buttons at the same time. The move, I fear, will have the problem of turning and aiming. For example, turning at 90 degrees will have your bulb pointing at something other then a TV.
The few ways I could think of to fix this are all bad choices. The first would be to have a button to reorientates the move or cancel out turning when you hold it. Which would be the definition of the terrible tank controls of pausing everything you are doing to face where you want to aim. The second way would be if you could hook up something to the mini usb jack to reconfigure the button layout. Like the gun case that sony showed actually did something other then look like a gun. This would be practical and perhaps enjoyable.
I also don't really care for the button layout. The small face buttons filled with a huge move button in the middle just stink. Why couldn't they have added the "move button" as a second trigger and made the face buttons bigger? The easy access to face buttons while aiming/moving would be a god send. For people with big hands, pressing a tiny move face button could end up with you pressing other button as well.
The PS-nunchuck is an attempt to put both the wii motion controller and nunchuck into one accessory. Which makes it worse as a result. The dpad is at the usual horrible spot below the analog stick making most of it unusable to people with larger hands. They could have at least put the D-pad off to the side or something instead of directly below. The PS-nuncheck then takes a page out of the wiimote by adding two face buttons, x and o, to the PS-nunchuck. Buttons that already exist in the original move in tiny form. But instead of imitating the Wii mote and having them in the back so you can flip the controller sideways to get another experience out of it. It is crammed between the dpad and the analog.
The only way I could see the move be successful in FPS gaming is if they allow full and utter customization of all buttons + actions with an xmb utility that applied to all games.
It still won't matter as much in fps games. Since my crummy old frag-fx will still be able to turn my character around faster, aim faster, as well as give me total access to all my face buttons on the side of the mouse as my palm spins and aims at ds3 impossible speeds. The fact will be that for shooters, the hardcore in the know will invest in a splitfish frag-fx before they go for a move.