I thought this quest was Awesome! I loved how it had the interactive dialog in it and yes, summonsing the ghost was pretty cool.
The hardest part I had was using the drowsing rod. I was beginning to think mine was defective.
As for defeating El Patron, I think it could of been a little bit more challenging. When I got to that part I thought I was just going to explore the ship not knowing I was going to fight him right then and there and I was alone but, I had no problems defeating him at all.
But, all in all I really enjoyed the quest!