Speed, tracking, carving ability. It needs to handle like a sports car rather than a monster truck.
I disagree with Dave on the maneuverability. To me that means easy turning which is the opposite of tracking. It has to have some degree of maneuverability but not at the expense of tracking and speed. That's where I see the difference lies between creek boats (Villain) and river-running creek boats (Burn).
There is a trade off. It is understood that a river-running creek boat won't handle funky water and steep, rocky, low volume descents as well as a creek boat.
Both boats should boof easily. The creek boat, because it has a lot of rocker. The river-running creek boat because it can get up to speed and launch with a couple of strokes.
All good boats whether creek boats or river-running creek boats should have all-day comfort, easily adjustable outfitting, easily accessible storage space and durability.