It takes quite a bit of practice and tweaks to the many Move settings to get the feel for it. Once you do, it's very satisfying to simply point and kill your targets while becoming more accurate than you can with the pad. Before I started the campaign in KZ3 (my first Move FPS), I stayed in the first area simply moving, aiming and tweaking since there are no enemies there.
Jumping right into the campaign with no Move experience is understandably tough at first, but I because I was used to it from KZ3, I was able to start on the toughest difficulty and beat it entirely with the Sharp Shooter controls.
Here's one tip for SOCOM's settings (works only if you have a Sharp Shooter): select 'Modal' mode in the control settings, and you can then instantly turn and aim simultaneously with the 'M' button (under the trigger) at max turn speed.
Release the 'M' button and then you can freely aim the cursor within the deadzone window. In other words, if your deadzone is very wide and high, you aim without turning your body, like a light gun shooting game.
It's an advanced control, but it allows me to run around looking left/right/up/down while holding M like I do with a mouse on the PC, and for medium to long range targets, I can release M and aim the cursor to shoot like a light gun game.
In close battles, holding M with Modal mode let's you easily circle strafe to kill an enemy as you keep them in the center on you stationary cursor - just like a PC FPS game. These are things you can't really do with an analog stick, especially since SOCOM 4 has no aim assists.
Another Move tip: turn off rumble! Unlike with a mouse, it's a little trickier to keep your hands completely still while aiming with a Move since you aren't resting your hand on anything. The rumble effect as you shoot makes your bullet spread wider than it otherwise would, so turn it off as you play.
My settings vary, but right now it is:
Max Y-axis deadzone
About 70% X-axis deadzone
60% Turning speed when touching deadzone (this varies for me, but with M held it always turns max speed)
60% Cursor aiming speed when not holding M (this varies for me)
If you have any other questions, let us know in the SOCOM 4 thread and we'll help.