I've been playing this with the PS3 Move for over 3 hours now and also with the addition of the new Move Navigator. I personally think using a dualshock controller and the PS3 Move is not ideal and if anything will take away the fun and ease at which you can play this game. Imagine doing the same with the Wii controller, well the same goes here it is not an ideal match(no matter what Sony have to say).
Anyway, the game is actually easier with the navigator and the Move controller, it only took me 3min to get into the game and it felt allot easier in my view that I ramped up the difficulty. Shooting with the Move is more intuitive and precise and I can sit back and let my hands do the talking. A person below mentions he can't see the reticule, but I've had no issue, you just need to make sure that you have the Move controller pointing at the PS3 eye when you start up the game. It should then pick up the controller and have the reticule on screen.
I found it allot of fun with the navigator and the Move controller and if anything allot easier than the dualshock controller. It really is a good combination and I could do things allot quicker in the game. I plan to invest in a gun caddy to make it more realistic for shooting games, it just makes more sense in my view.
Overall, an excellent addition for the Move and does not feel like a gimmick. It is precise and fun, by no means does it feel like a add-on to me, it feels very natural.
4/5 for me only because you can't run and gun in RE5. This combination would work very well with Dead Space 2 and I really hope they have PS3 Move support for Dead Space 2. Fingers crossed!