My house, Gryffindor is flawed because we can be very impulsive and often can take our bravery to the point of recklessness. And sadly, some of us can be rather arrogant. Like Cormac Mclaggen and James Potter in his youth. I 爱情 this 问题 because we're admitting that are houses are not perfect.
Like all the other Gryffindors said, bravery can lead us to make very rash (and sometimes stupid) desicions. Also, we are stereotyped to be goody two-shoes, always doing the right thing, but NOBODY always does the right thing. Anyway, no one house can be perfect. We all have flaws. So post them, and be a good sport about them! ;P
I don't know how general this is but I do notice a tendency for me to ponder over a decision in all eternity, I twist and turn all the pros and cons and never make a decision sometimes, it can be really frustrating.