They are chock-full of personality :]
No offense, (I love my stock breeds!) but in comparison, stock breeds are pretty dull, personality wise. Stock breeds are meant to be abel to take direction from the rider, in a split second, without argueing. An arab, bred as an andurance horse, is supposed to be able to make decisions for itself - To protect the rider. The bedouins also used to keep their Arab horses living in their tents with them - They can get along with humans better than any other breed IF you treat them right.
So - They have a lot more independance than your average stock breed. They are quick witted, intelligent, and have a lot of heart. Unfortunately these traits can quickly turn into resentment, misbehaviour, spookiness and aggression if you don't treat them fairly. They won't take mis-treatment on the chin, like a lot of stock breeds.
Have you heard the saying you tell a gelding, ask a mare, and discuss it with a stallion? I would say you tell a QH and discuss it with an Arab.
My Wildey boy is a pure arab - He has the most personality of any horse i've ever met. I got him when I was 11 and I had some good mentors - He has some bad habits because of me, but we have an awesome bond if you will, and he will try his heart out in anything you ask of him. I have so many stories of this horse going above and beyond to do what I needed him to do.
Latte is an Arab also - And she is such an incredibly fast learner. It's like she was just waiting for the answers to her questions - Instead of me training her, it's like i'm simply filling her in on what she has missed out on! I have the same kind of 'bond' (not a magikal bond, more of a 'click') with her as I did Wildey. I really think it's the arab nature - They, more than a lot of other breeds, can be a friend as well as a working partner.
Because they have some of the responsiblity to lookout for dangers - If they don't have a supportive and strong leader then yes, they can be very spooky and flighty. Their high head carriage, and large, wide apart eyes are made to spot those dangers that their rider might miss - And once they spot them, if they don't get any direction on what to do next, their flight instinct will kick in. This is where the 'spooky' stereotype comes in - Arabs without proper guidance can become very spooky.
Good luck - I have found that arabs can be tricky, can be hard work and hard to figure out, but the reward at the end far outweighs any negatives. They really are great horses.