The faction system

So about Divergent....
Frankly I liked it. Both movie and book. The first was good with an intersting dystopian setting in a dilapidated Chicago. They rely on a faction system, dividing people into categories by their strongeat personality type. My sister and I were discussing this, she thinks it marvelous. Even though that was what the entire book was dissmising. She says that a faction system would be a good type of government. No.
No.
No.
No.
This worries me. So much no.