Instantiate projectile rotation

So yeah t$$anonymous$$s seems to be a common problem and I haven't gotten any wiser after a few hours of trying t$$anonymous$$ngs out. The fireballs fly in all the wrong directions and I have no idea why :)

 using UnityEngine;
 using System.Collections;
 
 /// <summary>
 /// Create fire ball.
 /// 
 /// T$$anonymous$$s script is attached to the player and instantiates a fireball when "Attack" is pressed.
 /// </summary>
 
 public class CreateFireBall : MonoBehaviour {
     
     public GameObject fireBall;
     Transform playerTransform;
     Vector3 firePosition;
     Quaternion playerRotation;
 
     // Use t$$anonymous$$s for initialization
     void Start ()
     {
         //if(networkView.isMine == true)
         {
             playerTransform = transform;
         }
         //else
         {
             //enabled = false;
         }
     }
     
     // Update is called once per frame
     void Update ()
     {
         //mouse 0
         if(Input.GetButtonDown("Attack"))
         {
             //In front of the player?
             firePosition = playerTransform.TransformPoint(0,0,0.2f);
             //what the f---?
             playerRotation = Quaternion.Euler(playerTransform.eulerAngles.x + 90f, playerTransform.eulerAngles.y, playerTransform.eulerAngles.z);
             
             //call the function to instantiate the fireball
             fire (firePosition, playerRotation);
             //networkView.RPC("fire", RPCMode.All, firePosition, playerRotation);
         }
     }
     
     //[RPC]
     void fire(Vector3 position, Quaternion rotation)
     {
         Instantiate(fireBall, position, rotation);
     }
 }