Unity - Gameobject look at mouse

I've ran into a problem.

The basic setup I have right now, two objects: my camera, and my player object.

The player moves via Transform on WASD, and is supposed to rotate on mouse movement.

The camera is top down (At a slight "3ps" style angle, which keeps the player object centre to the camera's perspective, and rotates according to the players rotation.

This is the players movement script: http://pastebin.com/SvN8FuWs

This is the players rotation script: http://pastebin.com/uzZ7SKFL

The result of everything I have shown is it rotates, but it doesn't rotate true to where the mouse physically is.

While I draw circles with the mouse, it will do full rotations, but not consistently point to where the mouse is. I'm not sure as to why.

The desired result is for the camera (child of player object) to follow the players movement and rotation, while the player moves with its movement script, and rotates to point true to where the mouse is.

Anyone got any ideas? Thanks in advance.

Edit: if it helps, the current rotation works like this.

drawing large circles with the mouse around the player gives a slower rotation, than extremely tight circles around the player.

I'm not sure If I understand what you are trying to do. If you are trying to do something similar to the game "Dead Nation", then I would suggest something like this:

MouseLook.cs

void Update()
{
    Vector3 mouse = Input.mousePosition;
    Vector3 mouseWorld = Camera.main.ScreenToWorldPoint(mouse.x, 
                                                        mouse.y,
                                                        player.transform.y);
    Vector3 forward = mouseWorld - player.transform.position;
    player.transform.rotation = Quaternion.LookRotation(forward, Vector3.up);
}

If you want the camera to move and rotate along with the player then just make the camera a child of the player object.

EDIT: I got a few error, my bad, this is the right code.

void Update()
{
    Vector3 mouse = Input.mousePosition;
    Vector3 mouseWorld = Camera.main.ScreenToWorldPoint(new Vector3(
                                                        mouse.x, 
                                                        mouse.y,
                                                        player.transform.position.y));
    Vector3 forward = mouseWorld - player.transform.position;
    player.transform.rotation = Quaternion.LookRotation(forward, Vector3.up);
}