I agree with what you say about using nunchaku as a weapon. However, I'd like to point out that to use it more effectively as a weapon, you should hold the stick near the bottom(the end of the stick that isn't connected to the chain) for maximum range and power. Also, you should use your hips as you strike for more power as well. Take a look at this video, and check out the rest of this guy's videos on youtube:
He has a set of like 10 different weapons DVDs with instruction on various kobudo weapons including the bo, tonfa, sai, and a bunch of others that I can't recall at the moment. He's one of the few real nunchaku instructors out there that doesn't try to teach you flashy stuff. There are some other instructors out there that seem to be interested in teaching combat application, but they still show a lot of flashy, non-practical stuff. I don't really like or agree with Lee Barden much, but there is one thing he says that I do agree with very much: that you need to hold the nunchaku handle as close to the bottom as possible for use as a weapon. It makes a lot of sense. You might not have quite as much control, but you'll get greater range and power. Think about it like swinging a baseball bat. If you choke up, it feels lighter, and it's more easily controllable, but you don't have as much power in your swing either because you're holding it closer to the middle.
Here's the video where he mentions this, in case you're interested:
Anyway, nice video