For starters just taking the quiz is a reflective component of the experience. I was stumped on the question "comfort, advise, impress", but easily chose grey from "black, white, or grey"
I was shocked to find that my patronus is a Wild Rabbit. I honestly did not know how I feel about it. I secretly hoped for a dog, fox, giraffe or lion. After doing some research on tumblr I found that many were describing people with the rabbit Patronus as innocent and curious. They are said to be greatly interested in exploring the world. They are sensitive and deeply connected with their souls. It is cool to think that my patronus is reflective of Luna Lovegood whose patron us is a hare and encourages curiosity and unconditional lov for other creatures.
The rabbit as a patronus delves more into the inquisitive, open side of myself that I sometimes allow to be masked by acedemics and cynicism. When I told my boyfriend that the quiz cast me as a rabbit, he was shocked. He argued that I would be a predator, because I am more likely to stand up for others than to ride away from the fight. Maybe that is where me being a Gryffindor comes in. I think patronus may be more personality based, while Houses are more based on values. For me if you combine the two(Gryffindor's symbol of a lion and my Patronus, a wild rabbit), you essentially get a Labrador, which is what I am.
Also, I think our patronus is affected by what we are thinking about when we cast it/take the quiz. I was thinking about an affectionate, soft happy memory when I took the quiz. What if instead I had been thinking about conquering the Columbia River gorge? Would I be more prone to be a lion? I have taken quizzes on sites other than Pottermore that told me my Patronus was a lion.
Other friends took the Patronus quiz and were equally intrigued by the results. One of my friends got a Black Swan, which reflects her wit and drive to be unique. One of my friends was told her Patronus would be a black mare, which is interesting because her favorite character in the Harry Potter series is Ginny, whose Patronus is a horse. My other friend is an Adder and, given that she is a Slytherin which is representatives by a snake, makes sense. One of my friends was told that her Patronus is a grey hound, which did not made since, because she is most like a turtle than any other animal.
In the end, I concluded that there was a little good to be found in everyone's Patronus quiz results, but they are also to be taken with a grain of salt.