Hee. I have a few friends who count themselves as Gryffindors to the extreme who Pottermore placed in Slytherin and they were NOT pleased.

I find the houses fascinating as a whole, especially since the Sorting Hat acknowledges that most people could go either way, as it were, and how your choice ultimately weighs a lot in the decision. There are some lousy Gryffindors I'm sure, and some fantastically smart Hufflepuffs (not that I think Hufflepuffs are stupid, they're just not Ravenclaw), and some brave Ravenclaws, and wise-beyond-their-years Slytherins. It's about where think you belong or want to belong as much as it's about your separate traits, which is a sly way to teach kids some really important things about found families. Gosh, but I just love JKR and HP a whole bunch.