Well, about that. On a test I took long time ago, I was borderline Ravenclaw-Gryffindor. So I would still be happy being in Ravenclaw, though I'm not really that clever.
I notice that Gryffindor and Slytherin are the two extremes of the spectrum, while Ravenclaw tends to side with Gryffindor and Hufflepuff sides towards Slytherin. Further proof: note the locations where the dormitories are. Two towers; dungeon and kitchen.